I've never dealt (as in bought / sold releases) with music on a scale beyond my personal collection, but  I don't really see it as being relevant. I've dealt with eBay as a seller for a long time, and I know the stance they take once they deem something a breach of listing policies.

Unless you are asking out of personal interest - I am a buyer / collector of music releases, of course, but bootlegs / unofficial releases don't generally tickle my fancy. I was moderately involved with the music industry before my ebay "career", though (everything from writing reviews for an indie magazine, to co-founding a long-defunct record label that no one's ever heard of 🤣 ), to other nerdy stuff like cataloguing releases for Discogs. Neither area (ebay or music) is one where I'm particularly green.