It isn't that "they want their money to go to the poor," per se. This program is not means-tested. And it isn't really that they're forcing each other into agreement. As I said earlier, the idea is for the giving to be coordinated in a specific way. Individual transfers of money are not a scaled-down version of a basic income. The scale is essential to the integrity of the program.

Many of these people may very well already give money to the poor. I don't see why you assume they don't. But the guarantee is the killer feature here, and you can't accomplish that by your lonesome, or even as a small group. A version of this that doesn't cover everyone is not the same thing at all.