Ninjas wife is his manager so She probably was also in on the decision, even if Ninja didn't want to out her. Thinking about being in her position, it may be uncomfortable seeing so many strangers trying to "ship" your husband with someone else. *shrug*
At the end of the day it comes off as insecure though. When you're a celebrity you're always going to have fans that desire you to be in a relationship with some other celebrity they like. It's a shame Ninja won't stream with women as a result.