there's no assurance that you're going to earn more money from bitcoins because you invested them. There's no 100% sure profit in investing no matter which platform that is or no matter what company that is. Investing is risky.
Indeed, the best opting is to just save it, because why would you want to risk your hard earned money in some site that is not going to give that much of a profit and may take it without giving it back, you are better off saving some of your real job and buying bitcoin and saving it for the future.
Well, I agree with that. It's better to be safe than sorry but of course, when investing, it provides more percentage in earning rather than just saving. It's typically this way, saving will do nothing to your money, it will just sit there. If you just research well enough on what you are investing, then you could be safe.
Doing both is really the best thing to do. Saving all your money won't generate income for you in the future. And investing to much is too risky because you won't recover easily when your investments goes bankrupt. It is also good to diversify your investment not just concentrate on one income just because it gives you big profit.