Grrrrrrrrrrrrrrrrrrr.

guideline
noun [ C usually plural ] UK ​ /ˈɡaɪd.laɪn/ US ​ /ˈɡaɪd.laɪn/
​
C1 information intended to advise people on how something should be done or what something should be

Guidelines are not damn rules, they're guidelines.  Not only does theymos give the guideline that it's OK to give trust for a person, not a trade, it's also not actually abuse of the system to use it for anything at all.  The system allows anything to happen.  You can decide not to trust the feedback of someone if you want, but that doesn't stop them from making the damn feedback.  Grr.