Looks like you forgot to add about Gambling sites that has freebies ? or those who gives free satoshi as airdrops like Freebitco.in in which gives small amount yet its free that you can double or multiplied depend on your luck?
We usually think about free is totally free like just an airdrop. But actually, all of those things are not totally free. It is only a reward for completing a simple task. I don't think it is really encouraging but for those who did nothing, why not try?
I could say that this is a good way to start earning in crypto for newcomers but just to remind them also that be sure that they are visiting the right/legit site otherwise, they are just wasting their time. And aside from that, we must not expect huge rewards.
I tend to disagree mate, like in gambling site I mentioned above that you need no task but just create and account . Log in every hour and you will have some sats for free and even allow to use as bet in HI-LO .