Many OSM apps will also be reluctant to adopt a closed source solution that might be closed of any moment. And under what licenses will those reviews be? As MapComplete developer, I can not and will not be adopting a system based on Bluesky
Bluesky is not closed-source, it's mostly open. It's a hard mastodon-circle myth. Aside from being open-source, it's a protocol.
What I'm doing with Bluesky should be easy to reproduce with Mastodon, opening to 10 M accounts more.
People won't create an account to review. Not even a OSM account. We need to build on what's available, and ATProto is spot-on for this usage.
Thousands of people have already set up their own PDSes and it's inevitable managed hosts will appear soon. Blacksky just started migrating people over to its own PDS. AT's credible exit is close to reality after about two years while all the promise of ActivityPub and predecessor protocols has yet to materialize after over 15 years.