I don't understand. I use your app and donate. I do not want apps to block anyone for any reason. 1. Is there a Gab instance already? 2. Are you saying you won't let them use Fedilab? 3. Will I not be able to follow them from Fedilab either?
Quick reply : 1. No afaik 2. Yes 3. No, you will be able to follow/see them. It's a moderation issue not related to an app.
My idea is to apply the same process whatever the social network. If there is a move to Mastodon because they have been banned from other stores, I won't allow them to use the app with all risk that can bring.