because mastodon because dismissed twitter users concerns and thoughts the first exodus and bluesky implemented them in a way that's closer to twitter.
There have been some complaints about Mastodon for years; both specific ("quote tweets") and vague (get rid of shitty, often bigoted replies for profiles with a lot of followers or with a marginalized identity).
Mastodon largely hasn't implemented them. Maybe Bluesky has. (I don't have a BS account.)
The fediverse has many micro blogging implementations outside of mastodon if you don't like their featureset (and they federate with each other, unlike bluesky). The only features I couldn't find are those that contributed to making Twitter the dystopian toxic space that it is.
Using another ActivityPub-based interface is a LOT to ask for many users. They want a simple to pronounce name, they can stick in their browser's universal bar and be on a sign-up page in less than 3 clicks without making any more choices.
Well I am speaking about users who may be picky about mastodon's features. If someone is picky, I don't imagine they'd care much about just finding a platform with their preferred features, similar to how they didn't like mastodon and found bluesky instead.