Let me summarize my understanding of the situation and where you are right now. You've made some decisions and said some things you regret now. 1) inviting a user to be co-owner of a stream you created, and 2) you've also done and said things in multiple streams, where users then have already asked you or are now asking you for apologies.
The stream co-owner you invited then staged a coup d'état by removing you and others from the role of owner/moderator of the stream, seizing the memes of production.
TBH, I don't think Imgflip will take action on your behalf to return ownership of m/Reddit to you. I could be wrong about that though.
The email is
[email protected] you could also try sending feedback via
imgflip.com/feedback
I suggest you should think about how you conduct yourself, think before you comment, since users repeatedly feel the need to ask you for an apology for the things you've done and said, maybe change your conduct in the future.
Part of the way Imgflip works is the social feedback to your content, how the community reacts to the memes and comments you make.
It's only been about one day since the stream takeover. I think you should work with the user who took control of the stream, since they said they would eventually give it back.