Are you confusing "bandwidth" with "data"? Or are you using "bandwidth" to mean actual EM spectrum? If the former, then you might be wrong about parent's point

Are you confusing "bandwidth" with "data"? Or are you using "bandwidth" to mean actual EM spectrum? If the former, then you might be wrong about parent's point and "bandwidth provisioning" isn't even possible in many cases anyway. There is a maximum bandwidth a given modem and location can support for cable, and if someone is already paying for it that's that. Other people will in fact be eating into that bandwidth. Which may or may not matter for many customers who aren't actually pushing it anyway, but it's a real thing (unless Comcast has a good enough prioritization implementation that the owner can always get 100% on demand, though even a rough cap on guests would be good enough to at least make sure the owner is never starved). If the latter it's definitely an issue as well, a major complaint about it in congested areas is that it can take up the best channel itself.