I think you're somewhat overestimating the amount of bandwidth used by those services. TO watch Netflix in 4k, you only need 15Mbps, zoom uses about half of that for a decent connection and will downgrade nicely.
I agree with you, a lot of these services aren't as high bandwidth as people imagine but I will note that part of the reason is because that's what people routinely have access to. Netflix or whoever could be pushing higher bitrate content or potentially exploring other more bandwidth intensive ideas if people had access.
