Without having previous positive experience with them you will never know if they're legit, sometimes it's not what it seems. Anyone can make an website from scammers that charge bitcoins and never deliver the goods to law enforcement agencies making illegal deals to try to catch traffickers.
Markets and sellers have reputations and ratings, and are discussed outside of their sites.
You never did a fake review or give a fake rating online? It's really easy to do dozens of new accounts with throw away emails. It's called online marketing.
It would catch up with them if they didn't deliver. Someone would complain about them. Where is your proof that they are fake?
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