The investment that you will yield in a compound interest is significantly big but it requires a significant of time also. Most people plan their retirements with investments such as these in order to have a large sum once they reach the age of retirement (or depending on the plan initiated). You regularly deposit pay a monthly or annual fee (monthly is better and will result to a larger sum) and recover the proceeds at the end of the plan.
Conpound interest is one of the most greatest invention of economist. Yes it is a great way to invest, but for a long term. Compound interest really creates great profits if handles wisely and invested properly. You can go to stock market or insurances which fully utilizes the use of compound interest. Bitcoins does not work that way so you can't really apply it here unless you can convince someone to agree with you.
The difference between cryptocurrency and compound interest is the manner of investing. The former may require HODL while the latter requires a regular intervals of deposit into a fund that will accumulate in time. Compound interest can be considered the best type of investment IF you start early.