Mastodon is annoyingly gatekeepy too. They are super heavy on content warnings, and tend to not play nice when someone doesn’t respect those unspoken rules.
Also, servers are much more likely to defederate with each other, due to what some perceive as “minor scuffles”.
All in all I understand why people prefer Bluesky over Mastodon, it’s simpler and the search function isn’t borked to hell and back either. Blocking is also incredibly effective on Bluesky, if you block someone neither you nor they will ever see each other’s content again.