I'm sorry. But there is no universal cure. Attention is needed. More attention. Especially for applications to win in the top.
IMHO you need to pay attention to weak works that also fall into the top. When the bad works win in the competition, the illusion of a “blind jury” is created. And if the “judges” are blind, then there is a hope that the fake will go unnoticed. This is what the crook thinks. When photos of cats, sloppy drawings, garbage win - it means "blind juror" - it means it is easy to cheat. This is what the crook thinks.
Raise the requirements for the quality of applications, select the winners more strictly. This will make it difficult to deceive. This will protect you against deception.
Thank you for warning about the danger.