So far, of the ten or so "bux" sites I have tested, only a few are still alive and functioning properly. Those would be the grand-daddy of them all, Neobux and a similar one called Upbux. Most of them sprang up like mushrooms and then went buggy or missing within the space of a just a few months.
Upbux has what they call "games" associated with it for those who wish to play. I don't think the games are legal everywhere, as they are most certainly games of chance. But they are also optional, so I don't think the Paid To section of the site is taboo.
Not surprisingly, the Paid To programs I like best are PTW (Paid to Write) as most of these programs, especially Associated Content and Triond, are above board and honest. Some of the PTR (Paid to Read) and PTC (Paid to Click) sites are honest too. But shelf life for the PTR and PTC programs is said to average around two years, so with some of them on the books as long as seven years, there are naturally a whole lot of them that go south in a short time.