Twitter was rate limiting people and those people affected could not see government posts if they exceeded their quota. So in that strict sense it is quite reasonable.
Several government entities where I am left after the blue checkmark fiascos meant people were trying to impersonate the official accounts.
"They could have done the same on Facebook or any other network that they don't control and can't rely on"
They can however control a Mastodon instance, and starting one is a off-the-shelf operation now.
Another poster described it as "problems of governments relying on the whims of tech players in getting these messages out" which is exactly right. Those other platforms might have decided today not to show you the emergency warning unless you have an account and are logged in and have watched some ads first.
It is - for good reason - conventional wisdom that in order to get a message out thoroughly, you have "outposts" on _all_ the media that you don't own (including Facebook and twitter) and push content to there, but the "home base" is not on some platform where it can be locked, rate-limited or taken from you at the whim of some other company in some other country.
I think the more pressing thing is that they want to get anyone affected by Twitter, and Mastodon is a similar type of service. I’m sure they’re evaluating Threads as we speak.
Several government entities where I am left after the blue checkmark fiascos meant people were trying to impersonate the official accounts.