Investing in stock is also very good, but I feel this is for those with a lot of money to begin with, but on the other hand, with as little as $5, one can invest in bitcoin easily with out having to fill a long paper and go through document submission for verification.
Forex is also cheap to invest or trade. However I do agree that stock investment is a high intensive investment as you will need to buy a certain quantity of unit as specified in the public offer just like it is in launchpad investment. Regarding documentation, hardly would you see any reputable trading platform whether forex or cryptocurrency without means of identification or documentation. It is also called KYC in cryptocurrency investment and binance has a level of verification to an account before you can freely transaction on it, so the documentation is the same maybe be the process may differ.