Yes, but if you're providing people enough to at least cover the costs of necessary services (perhaps even providing 10%+ above costs to allow budget for R&D or

Yes, but if you're providing people enough to at least cover the costs of necessary services (perhaps even providing 10%+ above costs to allow budget for R&D or profit) then a competitor will come along who's against ads (for reasons: interruptive/intrusive, manipulative, etc) then there at least is a choice now possible - the ability to compete with ad-only funded options. Some people, maybe the majority of people, will be fine with using ad-only supported systems - exchanging their time, attention, and being manipulated - so then they have more of their UBI to spend elsewhere. The important point is the fluidity it allows within the system, to allow competitors to exist who don't need to depend on ads; and then you'll have the whole ad industrial complex + every other company that depends on influencing/manipulating people with ads to sustain their sales trying to counter how much UBI get so these systems can't be maintained without ads, keeping non-manipulative competition down at a disadvantage and unable to compete adequately.