There's already plenty of threads discussing this sort of stuff but the best investment in my opinion is to just buy and hold bitcoins themselves. Putting them in loans or start-ups or casino bank rolls is very risky and not worth the returns. I think most companies that want your bitcoins as an investment will more than likely turn out to be scams or fail at some point.
Yes , you can buy and hold bitcoin and wait until the value increases . But its not bad to invest in bitcoin in fact the potential of bitcoin in investing is much higher than to just wait for its price to increase. Not all in investing is scamers because they all know that it is easy to earn in bitcoin . So if you are going to invest you should be open minded and be alert if someone is going to scam you but there it is not wrong to try. Invest as low as possible at first then try to increase depending to what you earn here in bitcoin. At same time you can also do signature campaign so you can earn bitcoin .
That's better, holding your bitcoins will not make you grow your funds but only the value. There's plenty of investments nowadays and as an investor you have to do your job to make a right research on investments you will take. Try investing in online casinos, they have a great return and lower risk but if you want to grow your bitcoin fast, you can trade it or invest in ICO. It's your own choice, you just have to be cautious all the time.
Investing in the house edge of the gambling would be better than investing on a gambling against the house edge since the house edge has more probability to profit that the gambler. I agre, investing in ICO would be better specially when it has really huge potenital/has a huge investors. It is a matter of choic on what coins would you prefer hence it's better to research some coins so that you can ascert which one has a potential to grow for you to earn huge profit.