I'm thrilled to see companies shifting to Mastodon from Twitter. Mastodon's decentralized nature and open-source foundation provide a healthier and more meaningful online experience compared to Twitter's chaotic, ad-driven environment, specially after elon turd bought it
Germany seems to have been an earlier adopter of Mastodon (the instance is hosted by the government). If I understood it correctly they just decided to stop using Twitter, it's not like they started the instance today.
It says tooted by the Mastodon-Twitter crossposter, which has been killed by space Karen 8 months ago, so I am guessing they were using mastodon from that time