I suggest the following if the user hits 5000 submissions:
Define the 5000 as a soft limit.
Define something like 10,000 or "100 days after reaching the soft limit" as a hard limit.
When a user hits soft limit, you keep storing their submissions, but you don't let them see it unless they upgrade the subscription/buy more resources (Mailchimp's Blocks pricing strategy seems sensible to me). When a submission is received after hitting soft limit, you send your user an email telling them that they received a form submission, but they cant view it till they upgrade. (You keep notifying them). You can aggregate those notifications daily/weekly after the first few to reduce costs.
When the hard limit is reached, you stop storing those entries. And send the user 1 email telling him that you changed behaviour.
This is a fine idea, but be _VERY_ upfront about it, if it comes as a surprise, even though it's entirely reasonable, a lot of people will be angry and put off because they feel they've "been had" if they weren't aware of it when they got into it.
Great idea. This is actually already what we do for unsubscribed users. You get a notification that your form received a submission and a link to subscribe if you’d like to see it.
I’lol need to add some additional plans to support higher volume if and have an upgrade option.
Define the 5000 as a soft limit. Define something like 10,000 or "100 days after reaching the soft limit" as a hard limit.
When a user hits soft limit, you keep storing their submissions, but you don't let them see it unless they upgrade the subscription/buy more resources (Mailchimp's Blocks pricing strategy seems sensible to me). When a submission is received after hitting soft limit, you send your user an email telling them that they received a form submission, but they cant view it till they upgrade. (You keep notifying them). You can aggregate those notifications daily/weekly after the first few to reduce costs.
When the hard limit is reached, you stop storing those entries. And send the user 1 email telling him that you changed behaviour.