Hell just threaten it and make a few examples of folks to dissuade it. A business isn’t going to risk it if they’re worried they could be the unlucky ones. The ones hitting the top search results aren’t randoms making hundreds of sites, it’s often just C-tier blog sites that depend on dishing this stuff out regularly to get ad traffic.

I’m not saying I have all the answers here but I feel like this shouldn’t be too hard to at least make a dent in.