Hi,
Steemit and Steem.Ninja are not related. Steemit.com is owned and run by Steemit Inc while Steem.Ninja is a project run by Oracle-D Communities Limited. Steem.Ninja is another way for people to get an account on Steem. If you visit https://signup.steemit.com you will find alternatives. Steem.Ninja is intended for people who do not want to wait for Steemit Inc to approve their free account and people who want to easily onboard their friends and family. If you have more questions feel free to join our Discord server at https://discord.me/steemninja
Regards
The Ninja