eBay Subdomain Spam

23 out of the top 32 Google search results for titleist provx golf balls are ebay.com, subdomain.ebay.com, spam.subdomain.ebay.com, popular.spam.subdomain.ebay.com, etc.

Maybe they didn't intend to use the subdomains so aggressively. Maybe it is not search spam. But even if that is the case, it is a display of pathetic relevancy algorithms by Google. Time to move away from core domain authority or put a cap on the subdomains Google.