Signature campaign is not forever so Im not recommending it to those really serious to earn bitcoin. While suggesting that method, take them too for a long term process of method to earn bitcoin. By relying only on signature campaign, they won't be able to learn other methods to maximize their bitcoin earnings.
No one should keep this in mind that signature campaigns are forever that is why they don't need to know any other method of earning bitcoin, but why not take advantage of the opportunity you have got to earn some bitcoins with not any special skills and abilities.
I would say don't just rely with a single way of earning bitcoins fast and free and it is not a reliable source of earning bitcoin.
It is better if you know a lot of earning bitcoins such as selling your stuffs and skills.
Yes and there is nothing like fast and free, and earning bitcoin is really not easy you need to invest your time, energy and skills into it to earn some part of it.