We went into the pure mathematic realm discussing about non-finite resources. Infinity is a tricky case. Can a person win 500 lottery jackpots in a row? If this person is given infinite chances, the answer is YES.

The capacity to produce what is demanded in a commie system is still not an absolute zero. Given enough time a person could figure out all the private-public keys in BTC using a 5 year old smartphone.

UBI is unsustainable in a realistic scenario. Period. But it can work under unrealistic fictional conditions.