Question about using Bitcoin as source of wealth for universal basic income...

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Even Elon has said that for some period of time, when the robots and AIs take over most human jobs, we will need to switch to a system of universal basic income, so that people can pay for food and shelter. In principle this is a logical idea, but the question is: where does the money come from? What generates the wealth that pays for the universal basic income? At first I thought the answer might lie with crypto, but as investigated cryptocurrencies like Bitcoin, I learn that what give Bitcoins their value is scarcity--there are only so many Bitcoins that can ever be mined. So, with that in mind, it doesn't seem like the source of wealth that's needed. If I'm wrong about this please correct me, and if you know what the needed source of wealth will be, please tell me.