Bluesky is very intentionally about public posting. It's a bit weird to say people "don't care about privacy" when speaking of a platform designed to amplify and distribute posts as widely and effectively as possible.
Except that the design of Bluesky severely increases the possibility of your data getting out of your control. And I can hear the immediate responses of "oh if you didn't want it public, don't post it," but as should be frightfully obvious -- not everyone thinks like that.
That doesn't mean that there is no danger of people having "buyer's" regret later, or more importantly that there are issues beyond the individuals.