Only works if the phone is modern enough to have usb-c plus you must buy some hardware from Amazon (or pay much more, I suppose). Fuck that.

If you have a FOSS router laying around, you can simply put it into wifi bridge mode which inverts the wi-fi so it’s used to connect to the uplink, while the ethernet ports serve up the cloud. No need for a phone.

If you have a spare non-FOSS router w/USB and phone, the router may be able to usb-tether to the phone. E.g. a Fritzbox would likely work for that.