In crypto worlds really a lot of scams compared with other ways and it's really simple to understand - cryptocurrencies don't control by any government and bitcoin or altcoins much easier steal from people.
Much easier to scam because a lot of people easily trust online situation so that, they are easily invest from a simple world.
From one person do participate, a lot can do also because they trust a company if someone do invest on it so some cases create a scam because there are one or some person do invest even they didn't know if it was going on or not.