Every single platform they host this game on has functionality that let you send downtime message freely, and almost every live service with less than a quarter d2's budget does so because it's cost free and it's necessary by logic, there's no justification on not letting your players know when the server is down from the place they actually play
Sadly unlike Twitter, ordinary platforms don't encourage bots, and will give the CMs a hard time pushing brain dead memes and single mom jokes, those are all I see under Bungie help's tweets
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You never saw the in-game messages that the servers will go offline? 1h and 15 min before they go offline