This is not uncommon here in Turkey. I end up using my iPhone as a modem via USB tethering often. Mobile internet is much faster in Turkey (100+ mbs for cheap) than the wired network. It only adds ~10ping and can handle anything.
I'm willing to bet this will be the norm worldwide when 5G rolls out. Here in Turkey we have '4.5G' which is a marketing term for the latest generation 4G infrastructure. We only got 4G last year here, so we have the latest hardware.