The companies that are registered with ebay in their name are probably owned by ebay.

If you look at the ASIC site there is at least one company listed as a foreign owned company so is probably eBay.   There is definitely more than one registration on the ASIC site that belongs to eBay....some of us did a lot of digging several year ago when there was a fuss about using ebay in a name.  Quite a few of the registrations suddenly disappeared, so ebay had obviously done a bit of damage control.