what do you mean by cost-free? If you’re referring to earning Bitcoin through work, then yes, it’s possible. You could try joining bounties, completing tasks, and getting paid. However, most bounties pay in altcoins, so you’ll need to trade them to convert to Bitcoin. Keep in mind, though, that many bounties don’t pay well and are often scams, so earning this way can be challenging. But if you have patience, it might be worth a try.

try to look here https://bitcointalk.org/index.php?board=238.0