The impact of UBI on inflation depends on various factors, including the funding mechanism, the level of the UBI payment, and broader macroeconomic conditions. Some studies suggest that modest UBI programs are unlikely to significantly impact inflation.
I'm not opposed to those ideas, but I think UBI need not wait on them and is a lot easier to implement. We could do UBI now, and let state/collectively provided services be a provider-of-last-resort type thing, start with pilot programs and scale based on demand.
I agree that UBI can be less when there are more universal services, but I think there are a lot of "basics" that aren't universal or at least aren't uniform. Some people consider meat a basic foodstuff. Housing is rarely truly one-size-fits-all, primarily due to sleeping preferences. Healthcare has genetic components all over, so those vary from person to person. (Broadly you might think of menstruation supplies, or sickle-cell treatment, but there are much subtler genetic aspects.) Etc. UBI has a flexibility to incorporate capitalist providers into universal coverage as needed.
But, yeah, we absolutely need more controls on Capitol to deal with abuses like gouging. We need to enforce the ones we have on the books, but we also need more.