Yes, but I'd advise most to adjust their expectations. It's unlikely that one will make millions from investing $10-20k like the old days (the old days being 7-8 years ago). But you can still make some decent returns.
This. Of course i would advise more people to join but they need to know the risks they face.
So they won't do something extremely reckless like putting their house in risk only for some "quick profit". It could work, i bet that it worked for some. But when it won't work, the consequences are too huge to not name them.
Bitcoin is just like money, it is just a tool. The person who handles it is the one responsible for the actions that come from those.