This looks like a glimpse of how Mastodon (specifically: ActivityPub protocol) can really detrone Twitter. The world is full of governments and agencies and other Very Serious Organizations. They must hate having to depend on a single private company to get their message out. They must be itching for an alternative that gives them the kind of control that they have with phone numbers and email addresses and websites. Surely this is Mastodon's golden opportunity.
Seafile is not FOSS, as I understand it. But I tried it anyway, since I also found Nextcloud bloated.
In the end I went back to the purest strategy of all: peer-to-peer. My files are synced between devices over the local network using
ssh
,rsync
andunison
and never touch an internet server.