I can spot them but the feds are working on taking down the biggest residential proxy malware nodes. It's a game of whack-a-mole but I will let them play that game. There are some easy ways to spot some of them but I will save that for another article.
Not all residential proxies are malware. You can get paid crypto to offer up your connection. Prices will go up because of the malware crackdowns but the industry will still exist.