This is certainly a growing trend which was first started amongst end-users themselves, and slowly we've seen a few news media outlets also following suite. So far, only a very few government agencies have actually followed. Coming to mind are also The Netherlands. What is attractive for many organisations and agencies on Mastodon, is that...
The German state already has its own instance (social.bund.de). Our federal commissioner for data protection and freedom of information already recommended our chancellor to switch to Mastodon, but he declines every time and his office insists on putting screenshots of his tweets on their website.