It's always the nature of giving money that the funds could be misused, especially when anonymous. I can't think of way to improve that risk without putting in some sort of hoops to jump through or a verification process, but that is burdonesome for people that need help and people don't want to risk doxxing. The verification that money was given and received through reports sounds like an improvement possibly. It would be good if it could be more for proper mutual aid, like sharing goods directly or organizing food give-outs but people would have to trust each other more or risk doxxing again. A name change could be suitable.
If someone has verifiable information that a poster is scamming or whatever, they can take that to the mods directly, but I agree with the idea that meta posts cause more drama. As well the maximum request amount seems like a hinderance as some emergencies can be quite expensive, and it's not like a high request forces people to give more, people with the means can donate what they decide.