It is nice seeing you write this post thereby drawing the attention of people to occurrence in the community. I will only face one part of the post which is the solution.

In case we could confirm dishonest behaviors, what should we do as a community?

There is a mute button for posts that aren't wanted in the community, so if users are being seen with dishonest behaviours trying to copy-paste or recycle posts, the posts can be muted and the users notified with reasons.

I was Recycling posts, that is, shared a post today, and weeks later the same post went up almost without varying the content.

I like to see things from two sides. A lot of people might be intelligent but also struggle with writing extraordinarily long post (200 words can be long for some people). These users might not see their actions as wrong and so correcting them in a careful manner and helping them grow is another way a community can grow itself.