I think it is not a good idea to invest something that comes from a loan or a any credits since investment could always be risky at some point if you don't have funds don't invest at all.
You should invest money that you could afford to lose, I think giving your information in the bank is fine as long as the bank is working legally in your country.
I would totally invest only smaller money and money I could afford to lose. purchase wasn't sure if by linking a bank account to one of these companies if somebody could hack that information.
from the little research that I've done it seems like coinbase may be the best option for me. I'll do some more research and see if the any other ones pop up. Now I need to do some more information about this wallet thing.
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I think so.