It sounds like the beginning of a cast system, I can’t imagine it not being abused in our current economic system. It’s also essentially welfare + a bit extra so you can actually live on it.
How will this deal with home ownership and paying for your kids education? And then your kids end up being stuck in the same situation they were born into with absolutely no way forward. It’s already like this in a sense but UBI is very likely to amplify it imo.