You're definitely an exception
Two exceptions in this very thread. Ironic. If someone's paying £80 a month they're doing it wrong. Google do effectively unlimited for £5/month/user and as the other chap said, BlackBlaze, SpiderOak, pCloud et al. will also be in the same ballpark. As I said earlier, but you completely failed to address, the usage isn't there for most because the opportunity isn't there.
You didn't need 50Mbit+ for >4k streaming, because with predominantly slow internet speeds 4k wasn't a 'thing'. That is, until people had downloads fast enough... then lo and behold, the things available made use of the technology (eg YouTube added 4k). Are you seriously telling us that because something is outside of your use-case, that your mind can't envision that anyone else would want to do/use something? If symmetric gigabit, 10Gb or similar was available here widely, trust me people would make use of it. It isn't, so they don't - which isn't the same thing as 'nobody does this so they don't need it'. If that was the case you'd still have a 100MHz processor, 64KB RAM and a 1MB hard drive - because what you were able to do at the time didn't 'need' more.