I wouldn't agree that piracy is the same thing as a scam, so the analogy doesn't really works. When people download a bittorrent client, most of the time they know exactly what they're doing and that's what they're going to get. No scam here. The thing is that bittorrent moves information, and crypto moves money, and there's a bigger chance of things being a scam when it's about money. Maybe something like religions and sects would be a good analogy? Religions will bring you lots of information you may not care about, and sects will try to scam you of your money. But some religions have mandatory donations so the analogy isn't perfect.