I have investigated a number of ways to earn Lunch Money online, including something called Paid To.
You choose a username and password and sign up and they give you something like one penny every time you read a short advertisement. After you accumulate enough pennies to reach what they call a minimum payout, you press a button and the money goes directly into your PayPal account. If you like, you can pay to upgrade your membership and get pennies faster. Then other people find out you have gotten some money and they join and become your referrals, which give you a percentage of what they earn, too.
What makes Bux sites a little different from most PTR (Paid to Read) or PTC (Paid to Click) sites is that they have referrals for rent.
However, what also makes Bux sites different is that so many of them disappear without a trace. Not that other Paid To sites don't go under. They do. The average life span in Paid To is something like two years. But Bux sites are notorious not only going under fast, but also for changing the terms midstream. This can make shortchanged members quite angry.
Also, if I tell you about a site and you decide to join and then it goes under, you might be angry at me for telling you about a bad program. But the way it usually works is they start out being really good programs, or so it seems, and then after a lot of people say how much money they earned there, and a lot more people sign up on those recommendations, THEN they disappear. Sometimes this is done on purpose, sometimes it is simply bad management, and sometimes life just gets in the way for the owners of these programs. Their partners get sick or die, their domains expire, they have to get real jobs, whatever.