this is one of the reasons why majority of the population still think that bitcoin is a big scam.newbies should learn how to research and study what they are up to...its not just a one day big time life event.and as i always say to my friends that shows interest entering crypto dont think that if you invest today tomorrow you will be rich,its a matter of time and patience.and there is no such thing as double your money instant.you need to work for it learn more about it and focus.long patience is a must here.
That isn't a main reason at all for people to call bitcoin scam. The reason why they mostly call it scam is it's price movement. Some people say: They make bitcoin's price growing in order to get people's attention and then suddenly price falls and they make a lot of money, so bitcoin is scam, pyramid, ponzi.
Sometimes they also call bitcoin scam because of that reason which you and OP posted and people say: Hey, I invested on one website that promised me 5% profit daily and it took all my money and went away, so bitcoin is scam, this coin helps scammers and benefits them, not me.
Crypto caught the attention of a lot of bad people in the HYIP and what I first realized during the period of crypto run was that many HYIP started using crypto as part of their payment options in addition to other ones such as perfect money, payza, solidtrustpay and others. This did not stop there as many scam schemes are being created with the names of the scheme relating to crypto (e.g Bitdonate, bitconnect etc) while the payment processors being used were purely cryptocurrencies. If you have experience with investing in HYIP before you will know that those behind the scheme are very smart. Today I believe they are the same set of people creating many crypto-related project and throwing IEO on some platforms such as Latoken, exmarket, Crex24 etc. with the major aim of defrauding investors as usual.
Scammers love cryptocurrencies because as we know once you send your coins to another address and you get a confirmation then your money is lost, we need to teach people that a bank is not there to protect them just like what happens with fiat, they are supposed to be their own bank and they need to be responsible about their money or they will lose their coins, most people do not want to take this responsibility and prefer the delegate on banks but soon enough they will realize the mistake they have made to trust in banks.
To be fair it's not like that nowadays, scammers are caught pretty easily and more frequently so not all crypto is good solution for them.
And if there are people who are looking for chargeback and similar services on bitcoin and really think it has bank's privileges, then they have to forget it. Bitcoin is everything that bank isn't. You have anonymity, fast and low fee transactions, you are your own bank and no 3rd party controls you.