That's one thing some people who criticise Bitcoin don't understand, they'll make errors that would make them lose their coins and then call it a scam, instead of admitting their mistakes and take corrections, in Cryptocurrency space, especially Bitcoin investment, if you do things the right way you'll thrive but if you do others you lose and that's just it, asides Cryptocurrency, greed has been the downfall of many and they don't learn, you don't have to be too greedy to achieve success and it applies to Bitcoin investment too, cause greed can make one vulnerable to scammers that would easily mislead one into the wrong investment and before you know it their coins would be gone then they start blaming it on Bitcoin forgetting it's their actions that caused it. Doing the right thing pays, and when one picks the right choice of investing in digital currency (Bitcoin) you don't ruin it by being too greedy.
Such incidents are still happening in many countries. There are many countries that do not have a general idea about cryptocurrency. That is why many scammers easily loot a lot of money from the country's unemployed people by tempting them to earn a lot of money in a short time and very easily. In South Asian countries, people often encounter various scam companies, these companies lure people to invest by falsely promoting crypto tokens, later they fail to get the desired results.
There are even many countries that still cannot differentiate between crypto scams and gambling company scams. Especially in countries where the number of unemployed is high and crypto is illegal, scammers continue their activities very easily. Although they are basically victims of scams while gambling, they blame cryptocurrency due to lack of knowledge.
Promoting Bitcoin is also one of the difficult tasks, especially in such countries. Without proper knowledge they will use Bitcoin to get rich quick and when they face loss they will call Bitcoin a scam even they say that. So I think knowledge is the first thing that is important. Without knowledge you will consider Bitcoin as a scam too.