A bunch of instances have been suspended and silenced. Rationale included where extra context is available on the full list (see link below), but there are links to reasons for each suspension available on request.

These are:

verita84.com suspended
salesforce.social suspended
m.gretaoto.ca suspended
mastodon.social silenced
lain.sh suspended
bikeshed.party suspended
counter.fedi.live suspended
brighteon.social suspended
wintermute.fr.to suspended
freethinkers.lgbt suspended
theres.life suspended
434.earth suspended
mst.vsta.org suspended
landofkittens.social suspended
gorf.pub suspended

Full list at: https://mastodon.mania.systems/about/more#unavailable-content