Generally yes for stock OS. I like that GrapheneOS doesn't give a shit (and they don't have to, because they're not selling phones):
"Wireless alerts are fully optional since GrapheneOS adds a toggle for the otherwise mandatory presidential alert type. This is particularly useful in Canada where the government abuses the system and sends every type of alert as a presidential alert to stop users from being able to opt out of weather and amber alerts." https://grapheneos.org/features
EDIT: For folks with rooted devices, all alerts can be disabled with:
adb shell su -c 'pm disable com.google.android.cellbroadcastreceiver'
and reenabled with:
adb shell su -c 'pm enable com.google.android.cellbroadcastreceiver'
For folks on custom Android builds (or older stock Android builds without APEX module support), the package name is `com.android.cellbroadcastreceiver` (without the `.google`).
Au contraire - GrapheneOS gives a shit and actually represents the user.
It's funny - if I found some national opt-in list to where one could sign up for national/regional alerts delivered by email or SMS I would probably sign up. But alerts that commandeer my phone with some loud siren type thing? Fuck that (literal) noise.
"Wireless alerts are fully optional since GrapheneOS adds a toggle for the otherwise mandatory presidential alert type. This is particularly useful in Canada where the government abuses the system and sends every type of alert as a presidential alert to stop users from being able to opt out of weather and amber alerts." https://grapheneos.org/features