I think the biggest scam was perpetrated by BSV shit. The team led by CSW forked Bitcoin Cash and created BSV, which they sold to thousands of crypto newbies, claiming that BSV was real Bitcoin. CSW should have been in jail for that. He has a lot of involvement in that fork, and he misled a lot of people. This Faketoshi should have been punished for what he did to the Bitcoin community.
Imagine yourself as a crypto newbie and buying a fake Bitcoin. How would you feel when you realize that you actually bought fake Bitcoin? We may see other forks in the future. But considering none of the forks are actually successful enough, I don't think the devs would dare to do another fork.
CSW got in big trouble after that for making claims saying he was the inventor of bitcoin, but all just and a lot of demands on him.
His own project became a garbage project and was abandoned by his community after he left BCH and forked again into BSV, it became a real fork scam, not Bitcoin itself that did it.
Bitcoin does not carry out any fraudulent cycles, only the bad guys who take advantage of doing forks and claiming that the fork results are the real Bitcoin.
But if we talk about scams today, it is not only focusing on Bitcoin but altcoins or memecoins which are the biggest scams today.
Thousands of memecoins appear and create many scams in a matter of seconds, ICOs, IDOs and the like are no longer popular, it's a scam that still requires a lot of capital.