An account that posts everything it sees somewhere else, drowns that out and lowers the percentage of posts where genuine engagement will happen.

And this is not happening. cm0002 posts are not drowning anything.

Especially on a small site, that fractures the user ase between all the threads.

Not all users care about all the threads. Most users care about finding content that is relevant to their specific interests.

When a fediverse account does that to repost stuff already on the fediverse

Where in the Fediverse is that content? Again, the links I am seeing from cm0002 seem to be (a) relevant to the community and (b) bringing new content.

EDIT: you are right, the bot is pulling content from .ml communities and re-homing them. I wasn't this because my instance is not following that many stuff from .ml and I tend to favor the topic-specific instances. That explains why I wasn't seeing content as "duplicated". Sorry about that.

if you just keep throwing around insults

I honestly had not seen your profile before, and I had to check your history to see what about my comment would be insulting. I'm sorry. I would never guess that my example ended up describing you.