@jas0n All instances of Mastodon run the same source code, unless it is one of the many forks, like Hometown. But none of the other fediverse server software out there uses Mastodon code. They are completely different projects with completely different codebases. What they have in common is that they speak ActivityPub.
It’s not just that they may not care. They may not know what they’re being asked or know what the consequences are for choosing either option. Then they sit there for 30 minutes searching the internet for what the question means.