Increasingly marginalized and having to go through time-consuming hoops. There are a lot of things you're not technically required to have in the US like credit/debit cards, bank accounts, and government issued ID. But living a typical middle class lifestyle without them is... difficult.
I was recently denied opening a PO Box because I no longer have a working phone number. This is apparently "required contact information" (by USPS regulation).
Parking in my town is largely paid for via an APP — which is frustrating for somebody not using a mobile phone. The coin-accepting meters are rapidly disappearing.