Bluesky may not be training AI systems on user content as other social networks are doing, but there’s little stopping third-parties from doing so.
Don’t put anything there or *anywhere* online if you are concerned about it being hoovered up and used by whoever for whatever without your permission.
Sadly, that even includes your own website or blog. At least if you stay off meta, you probably aren’t helping folks that are complicit in human rights violations and facilitating genocidal incitement. Probably.