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...
my masto experience so far (starting fall last year):
1st instance: everything goes well, got a small, but nice following. at some point i find out - by accident - that i’m shadowbanned. contact support, they told me that someone complained about something and to appease them, they muted my posts from the instances public timeline (“account was not suspended because no rules were broken”) without even telling me. they refuse to this day to tell my what i posted to trigger this. deleted my account after this.
2nd instance: after one (!) day a zerg army of right wing weirdos started to spam my mentions, calling me a “fed” and other well known slurs because i posted something they didn’t agree with. deleted my account after this.
meanwhile i still have my 700 followers on twitter and for some reason no one shadowbanned me or tried to bully me away. guess i should just open my own instance :^)