No strong reason, but Mastodon allows various goverment officials and agencies to create accounts on the same server and probably has more functionality baked i

No strong reason, but Mastodon allows various goverment officials and agencies to create accounts on the same server and probably has more functionality baked in than most self-hosted alternatives. It's got a better interface than a CMS and even allows those government officials to follow and interact with other accounts in an official capacity. Personally it feels ready-made for government presence on the web.