With a bit of work, I have my phone USB tethering to my OpenWrt router and have actual Internet back in my house. Not decent enough for hosting services (triple NAT), but it gets the job done. Windows 10 managed to eat up around 200MB doing ... something. I told it I'm on a metered connection and to halt updates, maybe that should help?
Welcome to thundertoot! A Mastodon Instance for 'straya