I'm a socialist and good. It's a scam that some members of the ruling class have put forward because they don't think they can sufficiently control the bottom 99% using their regular combination of voter suppression, propaganda and threats of violence.
UBI is only ever seriously proposed in the context of eliminating all other government programs and regulations.
If I throw you into dog eat dog techno feudalism and then kick you even $5,000 a month that's worthless because the oligarchs are just going to use their monopolies to drain that right back out of you in the form of rent seeking and high prices from their monopolies and trusts.
In other words, if I give you a billion dollars a month then charge you $2 billion dollars a month to live you are still in debt to me every month. The actual number is don't matter.
UBI is a pipe dream people try to use to wallpaper and spackle over our failing economic system rather than address the underlying causes. Because addressing those causes requires deconstructing cherished sacred cows and they don't want to do that.