I reposted one picture of my favorite bird, the albatross, and then my feed was 100% bird pictures. I'm not interested in birds generally, just albatrosses specifically. But they were nice enough pictures so I kept using the app.
Then I tried telling it about my other interest which was robotics, and so I started liking posts about autonomous cars. Specifically, one day I liked a picture of some guy filming in in his car some other guy sleeping in his Tesla while it was driving autonomously on the highway.
After that my feed was flooded with selfies of dudes in their car. Like, "goodmorning sunshine, off to work, here's a quick selfie of me". Every time I opened the app it was just a parade of bird pictures and selfies of bearded dudes in their cars. At least on Threads the thirst traps were thirsty!
Bluesky had no idea what my interests were. On Threads we used to do a thing like "Hey @algorithm, send me people who are interested in X Y Z" and that worked. Actually first it didn't and then Threads made it official after so many people did it. But even still when it wasn't official it still seemed Threads was able to provide a better feed than Bluesky.
So I quit. Congrats Bluesky, tough feat but you've somehow found a way to be more annoying than ads.