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 reliability of third-party nitter instances has been hit or miss due to the churn, but the main nitter.net instance still works fine. They appear to be using automatically-obtained guest accounts.
https://github.com/zedeus/nitter/issues/983