the seller is selling a used item and the buyer is searching for a deal.
if lets say ebay offers this protection for sellers and other don't.and lets say all sellers jump to ebay.
all other platforms would lack good deals on used cameras so the buyer if he wants a deal would have to go to ebay and follow the process.
That's not how the dynamics of online selling works, unfortunately. Sellers have to go to where the buyers are, not the other way around. If you list your item on a site with no traffic and more overhead costs, then you're not going to be selling much.
the seller is selling a used item and the buyer is searching for a deal. if lets say ebay offers this protection for sellers and other don't.and lets say all sellers jump to ebay. all other platforms would lack good deals on used cameras so the buyer if he wants a deal would have to go to ebay and follow the process.