Hildegarde

Presumably still is.

The EFF is an American non-profit, that’s their area of expertise.

However, most of this article is about the DMCA. The DMCA is the US’s implementation of the World Intellectual Property Organization Copyright Treaty of 1996. A treaty which has been signed by 110 countries, all of which are required to pass their own version of the DMCA. Though some specifics may change, instances hosted in most countries will have to comply with the DMCA or very similar legislation.

In my cursory research, it seems to be possible to view mastodon through Kbin. And possible to view Lemmy through Mastodon.

Lemmy doesn’t have support for following user accounts, only communities.

All the platforms use the same backend. So there’s no reason full mastodon interoperability couldn’t be added to Lemmy in the future.