@amerika

> If you have a moment for a dumb question,

I always eventually do!

> what is the best way to figure out which instances do not federate with FSE?

Not a dumb question at all, but unfortunately a question with no really easy answer. You might notice under the "Federation Info" section of the fedilist page are two links labeled "Incoming Blocks" (servers blocking FSE) and "Outgoing Blocks" (servers blocked by FSE). Those point to the FBA service @mint runs: https://fba.ryona.agency/?domain=freespeechextremist.com . It's not perfect because a lot of the instances do not disclose their blocks, but it is more or less accurate.