My 81 year-old mother has never owned a computer. So yes it's not good to have critical government services only on apps or websites that require log in or subscriptions. Although to her it doesn't matter since she has no clue of these sites.
We went through a hurricane in 2022 and that was an eye opener too. Most "land lines" are no longer a line to anywhere it's just a phone connected to the Internet. Anyone with that type phone had no service after 24 hours without power. My 85 uncle still (even now) had an actual land line and it worked no issues.
After the hurricane no citizen had any way to communicate. Cell towers failed when generators ran out of fuel. No fuel because gas stations couldn't pump gas without power.
My dad passed away just a year earlier he had been on an oxygen generator that needed power 24/7. I don't think he would have survived. I'm not sure if I could even have reached 911.
For awareness radio is the best solution but even emergency services radio stations are being decommissioned here in Canada in favour of Internet services.