The Hive uses their own custom server software which is written in Java and has a similar api to spiggot, they spent over a year working on their software before they started creating any minigames
No i think all the servers that are in the featured servers list use mojang’s server software but edited.
Min*plex uses Mi*et Life*oat uses Ste*dfas*2 TheHi*e uses it's own And Mi*evill idk I put stars so that I don't advertize
That doesn't work when the names are popular anyways. Also, Lifeboat uses their own software too, (Steadfast is made for them) enforced by the fact that it's so watered down and not good to work for anyone else.