While I agree with all the other answers, they all took one side of your potential intention.

Ive tried many apps, and many of them are scam, of course (disappear on payout or ridiculously high payout which would,ideally, take about 3 years to achieve. You cant run it 24/7, so it accumulates to even longer time. And even if you get payout, it would be still in meretensof $$.

However, I never expected to actually earn from those apps. I wanted to try my luck in cryptocurrency and trading, to learn a bit more, but I didnt want (nor had) any money to invest to buy some.

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