Is there any rule against trust abuse? No there is not.
If someone is claiming to have been scammed by you who really has not (and refused to provide any such proof) will simply not be taken seriously by others.
If you are referring to the negative that you received from
sempyper, then I would not take it seriously, as it is unlikely that anyone else would (his avatar is literally a troll). I am not familiar with the claim/scam accusation against you in the altcoin section, however a brief review of the 1st post in the
refrenced thread, reveals that someone (or many people) do not like your behavior in various altcoin threads, but there does not seem to be any kind of claim that you stole money from anyone. Although your behavior seems to be controversial enough to warrant a 22 page thread inside of 3 days about what/how you post in various threads.
I don't take it seriously, and I don't deny being controversial. One may interpret what it means to be controversial in the altcoin section according to one's own experiences and biases.
And note that I have not raised any questions about other troll negative trust entries against me which do not claim a BTC risk or loss, I was just asking a question
about the specific question of falsely claiming to have risked BTC.
If there is no such rule about it, then so be it.