"but I think it is up to the readers to check if they suspect plagiarism."
99.99% of readers do not check anything. Usually, due to lack of time. And those who do, do it poorly.
Also most readers, falsely and ignorantly presume that the content is original.

" bot will do more harm then good especially looking at how little users we have, no reason for automation imo." that disabled bot had a very tiny error rate of about 0.01%.
Also, none of the comments that followed up on what the bot detected were automatic. All cases were later checked manually, just as we do with direct reports from the community.

"On Content Cops like Hivewatchers I have a split opinion. I tolerate them, but I would prefer to be good without them"

Those who have been against our project have almost always proven to be those who confuse freedom of speech with freedom to lie or spread dangerous disinformation.
Or those who confuse freedom of speech with freedom to exploit the platform or steal someone's content.