By default bluesky blocks adult content, once you enable it you can dial in what kind of adult content you wish to see. I know this is all anecdotal, like the links you posted... But I started a new account to see what it's like. I can scroll the default algorithm for 5 minutes and not see anything questionable, and my actual account exists with adult content turned on and I never see it. After signing up the new account, I can search for furry or diaper content, but it appears that none of it is like "nsfw" (mostly just people in furry costumes or diapers but no sexual content or nudity).