Some countries of late have banned bitcoin in light that it could lead to money laundering. However, a majority of laws don’t necessarily pertain to cryptocurrencies by its very definition and if you aren’t breaking the law, it isn’t illegal.
I think that those 2 things aren't comparable - bounty may be efficient if you have free time and instruments to do it, but it won't bring you a lot of money. Investing, however, may bring lots of money.