Shameless plug but I have a client that got rid of almost 90% by blocking residential proxies or HTTP proxies in general using our service [1]. I tend to think people try some measures that are very hard to maintain going for behavioural data and other indicators where all fraud sits on this L1 being a proxy or a vpn.
https://visitorquery.com - my startup. I'm curious if they use proxies or not. Datacenter or residential, my service can detect them. You have a free plan which should allow you to have a better understanding of your traffic, at least from this perspective. Shenanigans with payment gateways usually involve proxies so I'm almost certain you can use it to detect > block the abusers before they reach the checkout page.
Maybe that's why people don't bother targeting Linux. Look at your comment. Why are people so easily offended these days by things that are out here, doing no harm to anyone. Like, you could just hit the back button and go on with your day. Why do you need to be so offended? If this is the sort of stuff that triggers you I can't imagine how your day looks like.