Lot of negative comments here but IMO this is huge. The best way to keep anything commercial good in the long term is competition, and the only way to have competition with web services is if users can go somewhere else, which requires a portable identity/username and open protocols. Bluesky is currently the only platform offering both in a convenient package. Even Mastodon doesn't make it this easy[0].

[0]: https://github.com/mastodon/mastodon/issues/2668