Hacked accounts are definitely a concern.
I've bought and sold many items over the years on a high-end photography website that I'm a member of, we're talking 5 figure items sometimes without real worry.
Couple things they do - it's $69 a year to join, which probably eliminates 99% of the scammer types. And it has a reputation/review system similar to Ebay. Even one transaction that's not perfect can really set you back. With that, you don't have to go searching for people's experiences with the buyer/seller - it's all right there in the open.
But a hacked account would be a real concern.
I would never sell on Ebay or take Venmo/Paypal payments as a seller anymore. Cash or Bitcoin is the only way to receive payment and not have it taken back by a scammer.