There’s currently:

feddit.at.
feddit.ch.
feddit.cl.
feddit.de.
feddit.dk.
feddit.fun.
feddit.ie.
feddit.it.
feddit.jp.
feddit.nl.
feddit.nu.
feddit.nz
feddit.ro.
feddit.rocks.
feddit.uk.

They’re mostly country-specific, it looks like.
I have an account on feddit.nl, although it was badly chosen because I’m not in the Netherlands.
I suppose the only problem is how much ‘feddit’ sounds like ‘reddit’, maybe.