UBI should ideally be funded by taxes on the savings by coroporations due to automation and outsourcing which reduces demand for local workers. Then it would truly scale with the times.

Alaska is doing it based on a natural resource tax. Justin Trudeau in Canada just did an experiment as well - not sure where their funda come from.

I think companies taking advantage of a public good should be taxed and the result redistributed as UBI. Personally on an unrelated note I'd try to tax non-biodegradable materials like plastic and the huge amounts of carbon being released from the ground... but that's near impossible to do politically to any great degree.