I plan to make a convenient platform where users can post ads to buy, sell and exchange cryptocurrencies, mining, work, etc.
Is there any similar website on the market right now? From your short description, I get the impression that you're trying to make a dedicated Services board. Not sure how successful that will be considering websites that I know used to do this changed significantly over the last years (OLX, KasKus, etc).
Btw, is there any plan on how the escrow selection begins? Starting from scratch will make it difficult to know whether a trader is trustworthy or not. Can you "import" our track records on other forums?