Will come a day when instances advertise the number of other instances they are federated with and it becomes a feature, not a bug. I'm not a fan of nazis, but also not a fan of whimsical de-federation. The magazines or subreddits that prosper and thrive will be the best moderated ones. Defederating an entire server because of one poor sub/magazine is dumb.

I use Authy. Its fine.

Just try it. You'll be fine. Better to ask forgiveness than permission.