but I was paid by that site for 0.02 eth for a measly less than 20 number of posts
That is $6.
The signature campaign is offering up to more than 40x that amount. Suppose they pay out the lower-ranking participants that they accept right now, and will stop when they accept higher rank members. That means a lot of free traffic and assumed reliability, at least to start with.
This hypothesis also mimics the standard protocol of a ponzi and/or con.
Yup I understand, the only reason why I posted here is to inform that I was paid, though it's not the bounty campaign since I'm not eligible for it. The only thing that somewhat got my attention is the person earlier who kept on spamming the bounty thread, I only went to that thread to check why the website is down then I saw his posts lol.