Reedits motto was "fake it till you make it" and we know that disinformation campaigns are also rife on the platform so there is every reason to believe a single entity is behind these accounts, whether it be Reddit itself or a third party.

That said, there is kinda a sunk cost fallacy thing too in the sense that people have decided Reddit is "their platform" of choice and people will defend it like a diehard sports fan does for right or wrong. Just like in politics which is just as weird too.