Seriously i have zero idea what is going on with bluesky. I never used it. Why are people saying it's centralised?
I also heard that a lot of people are joining it.
It's subscription fees. They've already announced it. It's literally on their blog, and they've talked about it in their Twitch (they didn't do a VoD so here's a link to a YouTube video) and Reddit Q&As.
"In addition, we will begin developing a subscription model for features like higher quality video uploads or profile customizations like colors and avatar frames. Bluesky will always be free to use — we believe that information and conversation should be easily accessible, not locked down. We won’t uprank accounts simply because they’re subscribing to a paid tier."
Maybe they just end up selling all your data off to their 1,000+ data broker partners.
I don't really see how they could, seeing as pretty much everything (including Likes) is already public.