Better content.
Mastodon is full of keyboard activism and news. Finding content for/from normies is not that easy and is usually ignored (0 retoots or so).
Bluesky has normie content along news and is still pretty left-leaning, a couple of artists/creators have an account there.
Finding porn/hentai is also easier than in mastodon (and you don’t have to check every detail of the servers to know if it’s allowed).
Tl;dr: Bluesky requires no mental effort to create an account and has normie content.
I just follow a couple, so far I haven’t found accounts worth the follow, but just browsing the feed usually gives me enough content for a moment (I don’t browse it for hours).
There’s a Mastodon instance for my country (México)… but nobody fucking posts anything, a friend of mine tried it but all her posts were kind of normie content so she was ignored… hard, so she just deleted her account.
Also trying to check the content on others servers is cumbersome and a pain.
No comment, I blocked threads and I don’t really use flipboard.
I don’t think the Fediverse is ready for the normal public yet, it requieres too much effort (yes, dedicating time to read every little detail to pick a server is annoying) only to find out there is no content for them, the UI is very not user friendly (generally speaking), that maybe they landed on an instance that doesn’t allow what they want or it’s just a propaganda server.
As I said about SimpleX… it needs to pretty-up if the plan is to welcome normal people, otherwise it’s just us.