Confused over Custom Domain and Fediverse address

I appreciate the response, Jason. What has me worried is that in Manton’s docs, he says I will not be able to migrate followers.

If you’re using the fediverse support in Micro.blog, after changing your domain name you will need to reset the fediverse username. This effectively “deletes” your account profile from Mastodon servers. Anyone following your Micro.blog account on Mastodon will need to re-follow you.

Maybe things are different now? It tough to have “Mastodon expectations” when I have intentionally chosen to use a service that explicitly declares it will not support Mastodon, which is a totally fine thing to do, it just leaves me wondering what things I should expect to work, and which I shouldn’t. So, yes, absolutely, one of the Fediverse promises is “user migration from server to new server” but I’m not operating on a Mastodon server at all…