If all posts are first encrypted, creating a twetch account signs the right for twetch to display your content. If you don’t want them to, you can restrict their access with the delete feature.
Twetch has a non exclusive royalty free license to any content you’ve posted on this site. Since it is not encrypted on blockchain first, you can’t restrict access.
Twetch can censor, but because they don’t own the data, any company can trivially fork and display anyone’s content if they sign access to it. So if Twetch starts acting like lizard people, Twetch 2.0 can come and easily recreate ALL of twetch.