There are many ways to earn crypto free without invest or mining.
The popular is Airdrop but i think the best way to earn is Bounty.
Most of newbie always try Airdrop than Bounty.
It's obvious that newbies prefer airdrops more than bounties. One airdrop doesn't take much time: you only have to fill a form, join some chat or group. And then just wait for an airdrop. Forum bounty campaigns require high rank to get a sufficient reward. Also, almost every bounty takes about 2-3 months to finish it and get a reward. After that you have to wait for a listing to sell your tokens.
None of those are really good options to make money in the markets, it is true that airdrops are very easy since you do not really have to do anything but now there is a problem, you need to go through KYC and I do not know about you but I'm not willing to give up my information to people that most likely are scammers just for a few dollars, my personal information is worth a lot more to me than whatever coins the developers could offer me but I suppose I am part of a minority taking into account how popular airdrops are.