Probably less about direct enforcement, more about after the fact. Ebay doesn't want to deal with charge backs for hallucinate purchases

If Amazon has not defeated Perplexity yet, eBay is not going to stop anyone.

This. These kinds of "rules" are basically useless because they are not enforceable. It's exactly like having speed limits but no cops.

eBay is hyper aggressive about fingerprinting, they will catch things like it trivially. Browsers leak all sorts of information like what sockets are open on localhost, making yourself look like an actual person is very challenging to someone motivated to detect you.

> Impossible to enforce

Maybe, but a policy's or law's validity or importance are not contingent on them being enforceable.