Prop firms that offer challenges or entry qualifications for a fee are basically scams.

They make their money by demanding users to pass a challenge for which the user must pay a entry fee. And not only once but sometimes multiple times.

The problem here is that no trader is always 100% on a profit streak. Sometimes they make short-term losses, which they can later make up for. But if you fail one of the challenges, even once, then you are out and have to pay a fee to take the "challenge" again. It is basically gambling. You are betting on whether or not you will make a short term loss, even if in the long term you are a good trader who makes a profit.

A real prop firm hires traders, and does not demand they pay some entry fee for some challenge.