I know you can do surveys and other CPA schemes to earn Bitcoin, BUT, on most of those sites, you can't even withdraw your earnings until you reach a certain threshold. That is the catch. The owners of those sites want to offer you Bitcoin to complete certain tasks but they want to make it difficult for you to actually withdraw because they are in it to make money. Bitcoin is valuable and I think you'd have better luck selling a product or service in exchange for the crypto.
Nothing is for free, and for sure you will not get any free bitcoins or part of it, maybe 2011 this would have been the case when you got less then 0.10 Cents
Usually some suvery websites that say that you earn cryptocurrency if you do a survey, but you will earn like the smallest amount of bitcoin of 10 cents. But if you grind, you probably get like 50$ in a few weeks.
