Easy set up, easy use, no fraud risk, good value proposition.
There are improvements that could help it expand more quickly with additional services like an escrow service. Also I think you should do some research into how well your platform is accepted in different countries since there may also be regulations within those jurisdictions where people don't get crypto easily/easily because we haven't got crypto yet which makes us feel very isolated. We're solving problems around trustless transactions between buyers and sellers who want to transact without middleman which solves all three problems of cost, time & security.