I would not say dangerous. But there are a lot of people out there in the cryptocurrency industries who are really greedy. So they are doing eveerything to get your money, and of course there are also a lot of scammers in this industrie. And even if they are no scammers, they try to sell you eerything overpriced. Like the asic miners producer, who are using their miner first by themself for some month before they start to selling them for new to the people!