Though it’s too early to know who the eventual winners will be, I believe this trend captures the early beginnings of a new, decentralized global financial system. So to describe it, an analogy for the existing one is useful: bitcoin is the dollar, and Ethereum is SWIFT, the international network that coordinates cross-border payments among banks. (Since Ethereum is trying to do much more than payments, we could also cite a number of other organizations in this analogy, such as the International Swaps and Derivatives Association (ISDA) or the Depository Trust and Clearing Corporation (DTCC).)
Paid to click is a kind of online advertising similar to Pay per click advertising. But PTC is an incentivized promotion method while PPC is the standard advertising. In simple PTC advertising pays both the publishers(PTC sites) and the ad viewer(customer/members/you) but in the case of PPC advertising, only the publishers(site owners) will be paid for the ad clicks.