We have that.
"Unfortunately, secure mode is not without its drawbacks, which is why it is not enabled by default. Not all software in the fediverse can support it fully, in particular some functionality will be broken with Mastodon servers older than 3.0"
[Over my head, but for now I'll simply accept that connecting from mastodon.green with someone (myself) on pixelfed.social simply doesn't work at the moment.]
Mastodon.green is for people in EU, USA and some neighbouring countries. This Mastodon homeserver is operated by Albin Social