The Swiss Government has officially launched their Mastodon server at https://social.admin.ch/
In their official press release the Government confirms it is a trial for one year. They state that "Mastodon has several characteristics that make it fundamentally attractive for government communications", such as being beyond the control of others, as well as it being privacy friendly.
Official press release: https://www.admin.ch/gov/de/start/dokumentation/medienmitteilungen.msg-id-97696.html
Speaker of the Swiss Government: @gov