What are the methods of collection of BTC easily
What are the methods of earning cash easily? It's the same thing, don't look at the BTC as something else than another valuable currency. No one will give you money for free.
signature campaign can be called free money, just make useful posts and not spam. You can make it a hobby
Well you still have to "work" for it. Free money would be if someone just sent you 5$ and said "I've sent you 5$ for nothing/because you asked for". And you're posting comments that aren't spam, one word, etc... for the intention of being payed for that comment. So yeah, you're kinda working for it.
but for me this is free as long as we do not spend a bit of capital, just create a post useful and not too difficult to it.
there is not really free money falling from the sky and this work is not too difficult.