Your first point is actually not a OAuth issue, but how the provider designed it. You can build an OAuth provider that don't need to disclose anything(not even email)
Is this even a provider issue? If an application asks for scopes=[profile] then the OAuth provider has two choices -- categorically deny it, or ask you to authorize it. They all ask you to authorize it, and you can say no, and then the app doesn't work because the developers decided that you can't use their app unless you give them your profile information.
The app could easily ask you to check a checkbox next to each scope, and then write separate code for each combination of checkboxes. They decided not to do that because it's probably not worth your business if you don't want to give them full access. (Honestly, I click a lot of things on HN that ask for way too many scopes, and then I close the window and forget what it was. But the calculation was done -- they don't need me as a user or customer. I can live with that.)
I guess what people want is an IDP that will give applications fake data when you deny a scope. But no application developer wants to deal with that complexity, so they'd never integrate a provider that does that. (They probably moved away from email+password because of all the fake emails that people provide.)
On the other hand, it's mandatory for iOS apps to use Apple's sign-in which auto-generates a fake email address for you. So I suppose some progress is being made. (I have an iPhone but I've never seen this supposedly mandatory OAuth provider. I only know about it from reading HN. So maybe it doesn't actually exist? I have no idea really.)
Yes it is really provider issue. Apple implemented it and so can any other provider.
I also don't think people want an IDP that provides fake data when you deny a scope. That's a bad implementation IMHO. When you say no that means you don't authorize access for that scope, not that send fake data. Applications should deal with it.
You are fighting conflicting constraints, though, and that's the underlying problem. Application developers won't use an IDP that protects user data. They want that data, that's why they wrote their app! Because nobody would use such an IDP (at least not without being forced to in order to be on a large platform), nobody will write such an IDP.
I'm actually working on an open-source IDP in my spare time, and to me this sounds like something to seriously consider doing right. I appreciate the idea and the discussion. I doubt anyone in the real world will care, though. (Sometimes you need to get the early adopters that do care about these things, though :)
As a user I don't really care about the way they build it. I care about the spec to deny them forcing me to disclose the data.
I once tried to sign-up with Google an it asked me to allow (with no option to deny but continue) to share my specific personal details. I've cancelled and never used this technology ever since. I didn't have to specify the same details (which Google was going to share) when signing-up with an e-mail address.
The spec should discourage sharing details beyond necessary, prevent any details from being shared silently and ensure user can always deny and continue.
But there's nothing in the spec that requires you to disclose that data to begin with.
And there's nothing they could write in the spec to deny that besides a perfunctory "please don't do that" which companies could ignore without consequence.
Sure they could. What you allow or deny would be enforced by the identity provider. The relying party simple would not receive the data and could not access it.
However, that’s really about OpenID, not about OAuth.
The spec could say something like "a client may ask for extended information but can't demand it unconditionally and must gracefully handle situations when access to particular fields is denied".
The problem is that you can't make _everything_ optional, or else the user can deny everything and the application then has to tell the user "You denied X, but we really need it to proceed. Try again...", which is a definitively worse experience than having the grant request say "here's what this app is asking for".
This is anticipated by scope requested by the client being able to be ignored by the authorization server. This appears in the AAD flow for the user as a list of toggles. The application has to handle the case where the scope is less than what is listed - this is all in section 3.2. Actually defining what data or permissions is bound to what scope is rightfully beyond the goals of the specification.
OAuth does what you want, but also does what you don't want.
This is like Android allowing apps to ask for permissions they don't "need" because, well surveillance and user data brokerage is the business model that most are info and the reason many apps are "free" or "cheap" in the first place, crowding out more honest business models.
Maybe there could be an initiative for apps and sites without predatory practices, like "apps/webs needing no personal info from you"
