Anecdotal, but there was a period of a 3-4 days in 2020 when my internet was out and I exclusively tethered my PC to my phone for internet.
That was on 4G (~70 mbps average speed) and it was fine for light media consumption - browsing, youtube, emails, and Netflix.
If you can get reliable 5G speeds, it should be fine to run a house on. However, some phones won't let you use your phone as a phone while its in tether mode.
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