It's this reason, in my opinion.  My guess is that these are sockpuppets of some of the better-known Meta trolls that no one is listening to anymore.  Creating new accounts espousing the same crackpot ideas creates the illusion that the trolls have independent support.  I'm not buying it.

My suggestion is to put all the new accounts on ignore if you don't agree with what they're saying--because they're probably not going to change their tune and will keep repeating the same tired old rants against DT, the trust system, merits, and more.  It's all just more noise on Meta.