One common theme amongst non-genuine Mastodon instances is to combine the platform with an Initial Coin Offering scam.
A notable example of this approach was Hiveway, you can read about that here: https://medium.com/we-distribute/hiveway-io-shamelessly-rips-off-of-mastodon-and-slaps-a-blockchain-on-top-for-some-reason-57b7aba3e84f
Avoid scams. Prefer genuine Mastodon software.
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!