1. Gambling - i hate gambling everytime i play i lose i think i have a bad luck and 10% chance of winning and 90% chance of winning everytime i double my bitcoin i get busted always
2. Tradings - i love trading , trading my bitcoin into other coins it helps my bitcoin to grow fast
3. Hyips - Ponzi Scheme And risky - ponzi is too risky you don't know if tomorrow the site will be die and run your btc 
4. Crownfunding - earn by gh and ph - im a bit sure with this because i already get my roi which i started to invest last two months