This is Matt Stock sellling these correct?
I believe so. If my memory serves me correctly, Knight Collectibles suddenly popped up when Make Mine Marvel got temporarily suspended, selling pretty much the same non-Topps Wacky Packages stuff that MMM had previously listed.
It's just too difficult to police the gazillions of sellers on eBay. I've reported a few sellers for items that were obvious copyright infringements, and it typically takes eBay about a week to get them to pull down their item. Then miraculously there's a new account that pops up, from the same geographic location, selling the same copyrighted material the next day. I eventually just gave up reporting them, and I imagine most people who do report them eventually give up.
It would take a large corporation with deep pockets like Topps to report the issue and get all the Wacky Packages knockoffs pulled down to make a change. I don't know if Topps just doesn't care or if they just don't have the time to do it. They shut down another knockoff years ago, who wasn't selling on eBay, because of the thick black border around the parodied image that Topps claims infringed on one of their copyrights. Topps has gone to the thinner borders with everything they've made lately, but I notice these knockoffs are using it, so it seems that legal precedence has already been set and could be easily used to stop these if Topps really wanted to do it.