Now that is how a company pro-actively communicates to their userbase and the public at large! Honest information but inspiring confidence in their platform as well as their support. Well done fastmail! Kudos!!
Just to be fair, this is an instance of pro-actively communicating good(ish) news. Not everyone does this, so of course it's good to encourage more of it, but it's much easier than pro-actively communicating bad news.