Fast-forwarding parts of movies for your own private use is entirely different from selling an unlicensed edited version of original content, which is precisely

Fast-forwarding parts of movies for your own private use is entirely different from selling an unlicensed edited version of original content, which is precisely what CleanFlicks did. Unless that content is licensed under a free licence that specifically permits you to remix content (e.g. some Creative Commons variants) selling an unauthorised edited version is unethical and probably illegal as well. By arbitrarily removing parts of original content and publishing the changed versions CleanFlicks were altering it in ways the content creators didn't intend and it's perfectly understandably that those content creators don't want to be associated with these versions.