Earlier quoted context omitted.
And it didn't involve a really confusing question as a barrier to entry.
Bluesky asks about which server to use on registration like mastodon.social does. For me the difference seems to be better marketing for Bluesky which makes people want to deal with the change and somewhat enjoy it rather than see every obstacle as a pain. Bluesky does have some advantages like starter packs (and network effect now that it has so many accounts).
so the slick registration flow nets you less lock-in compared to if e.g. the mainstream Mastodon app were funnelling users onto one megainstance, since you can still get away afterwards without needing people to re-follow you