Doing some research is your first task if you are planning to invest your hard earned money or you can choose to avoid all investment offers that you see. No one is going to force you to invest into something that you don't want to especially if you have no idea what is it all about. Scams are everywhere and you can't avoid it but if you have some knowledge of how scammer people do their job then it's too easy to spot a single one.

The only thing that makes them easy to spot is if they offer a too good to be true results but that's just a lie because they were all good at talking but can't show any results if you ask them. So does a cloud mining too is not what you thought it was only few cloud mining that are legitimate in the past, I don't know if they were still operating today.