“We have the chance to save U.S. democracy and rule of law, to elect the first woman President of the United States, and to send TFG packing. By contributing to Kamala Harris’s campaign via this portal, we can also encourage her to create a distinct presence on Mastodon, not mediated by Threads or any other social media provider.”

Promoting Mastodon isn’t even a tertiary goal. It’s just an “also encourage”. The primary goal is fundraising for a political candidate.