For me, the easiest way to earn free tokens is to participate in ICO signature campaigns. If you delve into the technique of this process and study the theoretical and practical issues related to the crypto currency, it will not be difficult. However, until this time, you need to learn a lot and pump your account to a more or less high level. This will take at least six months. Participation in the ICO signature campaign will also take three to five months. If you are willing to study at this forum for about a year, then you can earn your free tokens.
I don't think signature campaign is the easiest way to earn crypto. Cause you also can earn some with the help of twitter bounty campaigns or airdrops. And these ones are much more easier than participating in signature campaigns. Although the stakes are bigger in signature.
Plus, you needed time to upgrade your account and to make it more profitable. unfortunately, now... with this merit system it's almost impossible to get high rank. Well, maybe it's possible, but really challenging.