Just finished "Bullshit Jobs" and it ends with advocating for a UBI, explicitly as a plausible first step towards fixing/dismantling capitalism.
Its a pretty solid argument, as long as you put the caveats of the goal to be to expand the benefits of society universally, not to consolidate the welfare state and reduce cost.
There are a lot of issues and technical details that one can imagine, and ultimately if the goal is to liberate all humans and save the world from capitalism, further steps would have to be taken. But a UBI does seem like a reasonable first step.
Though I guess the only would world the capitalist class would ever let a UBI happen is the world where we force them to, since even the $2000 one time payment basically is never going to happen.
So UBI as a advocating tool or a rhetorical device, but I don't think it should be a goal in of itself. A UBI is the compromise position and leaves the Capital class in place. Something closer to Universal Equal Payments (working title) should be the goal.
UBI for imperial citizens is like the Alaskan Oil Dividend. It's distributing a share of the spoils in an effort to bribe you to overlook the exploitation of a place you never go to, anyway. Even if it's understood as a backdoor path to "the product of all belongs to all", unless the tax on profits is 100%, the exploitation isn't going away. Most proposals for UBI are better understood as National Profit-Sharing. I think de-commodification of essentials is a better line of effort than bulking customer base for privatized essentials. Don't give them a check to hand over to the landlord, just give them the damn house.