Mastodon is, as we all know, a clone of Twitter.
Twitter was, since it was created, designed to be a broadcast mechanism first and foremost. This goal shaped the very format of the service. The reason to make a Twitter account was to make use of the broadcast mechanism to publish a message, to the public. This is where the idea of "personal brands" came from.
The whole point is that it's public, to get a message to as many people as possible.
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A silly domain for test deploys, now has a mastodon instance. A place for memes as shitty as the name. Zero bullshit tolerated.