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.