One of the most common misconceptions regarding cryptocurrencies, in my opinion, is that they are anonymous. Although several cryptocurrencies are made to offer some degree of anonymity, they are not totally anonymous. On a public blockchain, every transaction is logged and linked to the wallet address of the user. To be clear, cryptocurrencies aren't totally anonymous even though they can provide a greater level of anonymity than conventional financial systems.
In this particular misconception, I can say people are just misunderstanding privacy and anonymity of cryptocurrency while both terms may seems similar, they are not entirely the same and if people can pay attention to their differences, this misconception would be a thing of the past. Privacy refers to the ability to control how your information is shared with others and anonymity on the other hand, refers to the ability to remain completely unknown. In the case of cryptocurrencies, it can provide privacy in the sense that it allow users to control who has access to their transaction data but however, they cannot provide complete anonymity since the data is still visible on the blockchain. Although, it's worth noting that the user behind the data is anonymous but the data is not.
The biggest misconception about crypto currency has been it's a get rich quick scheme, people often thinks that they will become millionaires overnight and this is one of the biggest reason why people lose money on crypto currency and end up hating crypto and creating fud.
With no doubt, this has been the biggest misconception about cryptocurrency because many people right from the inception failed to realize that cryptocurrency is a long terrm investment and it's not something that's going to make you rich overnight. If you're looking to make money quickly then, crypto is not the right investment for you. But if you're willing to be patient and invest for the long term, crypto can be a great way to build wealth over time.