I think it is safe to invest in cryptocurrencies as you can have more of them in the future if the price of the currency is high and also the most of the wallets are safe to keep your money in it
I think cryptocurrencies are the future because they are easier than using money and also more secure as you can use wallets in your phone or your computer.
I also never reach the minimum payout but i think the most of apps that used for earning you can earn from them by sharing your referral link to make the best use of it
The apps or wallets that i used before are Trust wallet and atomic wallet, those wallets can be useful for anyone to keep his currencies and withdraw them at any time.