I think those who talk bad about cryptocurrency are either ignorant or traders. There are thousands of people in the world who are not related to cryptocurrency in any way. They basically start spreading bad words about crypto after hearing the name of cryptocurrency from someone else and hearing about its disadvantages. As a result, many ordinary people start saying the same thing. Which happened to me too. If I had not joined the forum, my misconception would never have changed.
Basically, those who say crypto is a scam do so because of their ignorance because basically crypto, especially bitcoin, is like our savior from inflation and bitcoin can even make us achieve financial freedom. It is undeniable that there are also many scams under the guise of crypto or altcoin which are scams, those who join and invest in these altcoins experience losses and then they consider crypto to be a scam, this happens a lot.
In my country, there are quite a lot of ponzas in the name of crypto investment or trading but in reality it is just a ponzi scheme that makes many people suffer losses and those who become victims because they are tempted by big profits. In fact, basically those who say crypto is a scam are those who are victims of the project and of course because they are greedy because they are tempted by big profits.
However, those who already understand crypto will not say crypto is a scam, crypto is an asset of the future but it is also full of risks if invested irresponsibly.