If I think about Is Bitcoin a Ponzi Scheme there are so many articles arguing Bitcoin legitimacy to those MLM schemes.
Bitcoin is not a ponzi scheme but ponzi schemes uses it to scam people, and therefore people think that it is a ponzi scheme, but it is really not, i.e. fiat is also being use in illegal activities, corruption, fraud, and even scamming people, yet, they do still love it beyond those cruel things that is happening 'till now in the society, you might ask what is the reason why people still trust fiat, well it is because the Government says so.
We always listen to the Government having this mindset that they all know what's the best for us and they will not recommend something that will be bad for us, no, that is entirely wrong, fiat is worst than cryptocurrency, that is all to that.