you better make their own investment. you can trade altcoin. Never store investment in Ponzi. You will regret it if ponzi know !!!
This is my choice on where to invest your bitcoins. It's going to be risky if you are going to invest that with ponzi's and yes invest of profit, you will get regret upon investing there. Trading is one of the most trusted investment in the crypto world and it has been proved by many of us but learn to trade first before investing.
Ponzis and HYIPS are not even a real investment in the first place. Putting your money in a high yield invesment program is a joke because you are putting your momey into a fake company that fool other people. What really happens is the old member will receive the new member's money and the cycle will continue until the system will go down because the site owners will run away with your cash. Invesments are real properties such as stocks and real estate. Not something that only exist around the internet.
At the first place, if you are not aware that there are scams in bitcoin or you are still new. It's hard to identify and say that they are legit paying but in the end when they started to run, you will find it out that they are totally scams. I've learned from my mistakes and I don't want this to happen again, I don't want to be fooled again.