And right after that we can remove any FTP client that uses the FTP protocol to download content Google doesn't like. We should scan all apps that use a common, published protocol to make sure the protocol is not being used to consume objectionable content. /s
The app is not the service; the protocol is not the platform.
I think you might have misread my comment; I wasn't suggesting whether a course of action was correct or not, but just explaining how it could technically be feasible. I interpreted the comment I responded to as not understanding how it would be possible for Google to have done this a certain way, and I was theorizing one possible way they might have done it.
Ah, then yes, apologies -I did not mean to put words in your mouth. Technical feasibility is likely easier than imagined; most Mastodon services use the auto-generated list that appears on their "about" page - easily scraped if not available through the API - here's the list on the instance I moderate on for example: