There are also organizations that promise you not to charge any fees, but when they get to the back, they will say to you, "To give you an award, you need to charge an award fee;" I want to charge you a little expert appraisal fee. " Personally, I suggest you consider this situation. General formal institutions not only don't want you to pay for public welfare competitions, but also give you bonuses!
Suggestions are for reference only, I hope I can help you!