I guess the edge that centralized marketplaces have are consumer and seller protection.

eBay's Money Back Guarantee is far from perfect, though it ensures that the seller delivers what the post says. Same goes to Amazon. They also have protections for seller in place in case the buyer deviates from good buying practices. So far, I haven't seen decentralized marketplaces offer such protections from both parties, and perhaps that's why people will still choose to buy and sell on these marketplaces despite the high fee.

People tend to always play on the safe side, and employ fail-safes in order to not get burned fully. It boils down on what the consumers and the merchants think, and decentralized marketplaces don't address that directly.

I disagree lol. It's not a mind game when a player is competing against computer or games where only luck is involved, for example, games like roulette, dice, plinko, keno, these games are totally random and there's no mindtrick we can use. In games where sometimes skill is needed like blackjack, then also we can't use any trick because even though there's some strategy needed, it depends majorly on the luck of the person what cards they get!