I don't understand what people are scared of
Anything to complain about

, because 10 seconds to turn of a feature is too much.
And people with the meh survived without it and don't need it who by that measure should opt out of modern healthcare.
If you're worried about being tracked then you just wouldn't have smart phone full stop. The govs ability to send a message makes no difference. They fucked up by not making use of the features built into smartphones before and took them ages to send out texts during covid.
Some charities are using it to get a bit of publicity, they're after all a business and any attention is good. If you have a hidden phone, it'll probably be off or on aeroplane mode, definitely will be after weeks of doom mongering about the government now snooping in on your playlists

.
It'll just be used to say don't go outside during really high winds or your area is going underwater, yes some people are so stupid they need telling.