Any downside to unfollowing a lot of accounts at once?

There was a fandom I joined a while back and I followed a lot of accounts for it. Like 300+.

However, I am no longer interested in that fandom and I plan to clean up my Bluesky feed by unfollowing a lot of the accounts that I followed previously. I'll continue following the ones that followed me back, but the rest I'm going to remove.

I heard a rumor that if you unfollow a lot of accounts at once that Bluesky puts a flag on your account that prevents you from unfollowing anymore. Is that true or just a hoax? If it is, can I get around it by staggering my unfollows over multiple days?