Well, I get it. You need a good defense against scammers. There will be a rating system and a complaint system. Can you offer more options to fight against scammers and tips on functionality.
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Even the top review and rating sites like Trust Pilot are hounded by fake reviews and ratings; you need manpower to handle all of the incoming reviews and ratings because ratings and reviews can be manipulated, its easy to hire people to do a positive review for your platform and negative reviews to your competitor.
If you do not know how to handle this, better not to proceed with your classified ads; there's too much work involved.