They send false reports on your posts randomly right? Or just pick some of your latest posts or target all of your posts...

It will be up to clients to consider this. The web of trust model of trusting your friends more than strangers will likely be useful.

If you have to report someone's posts often, that person will likely not be someone your friends follow.

If you're a public figure/influencer, you might want to use a second account to report people.