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...
To clarify, it is not that you won’t see content from other instances, it is that your instance only stores content from another instance when someone on your instance has subscribed to it. So if you decided to subscribe to a bunch of things on other instances with hashtags matching your interests, then you and other people would start to see this content showing up when searching for the hashtag on your instance.
Ohhhh gotcha, appreciate the clarification, thanks!