@Jedicat Dunno about shadow ban, but lists may be a good tool

I do recognize that for years twitter has "managed" feeds. I suppose the could be what you refer to

@steelhoof A few years back they tested out a new algorithm that detected bot behavior, than banning people without warning. There was no change in the account from the users end but no one could see them unless they were on a list. The various fandoms got hit hard because we were constantly tweeting about our movies/ shows.

@Jedicat Yeah, some of the stuff I was thinking about that makes twitter less trusty