A: No. There is no official developer, no customer support email, and no legitimate website. Every "official" site you find is run by third-party affiliates trying to trick you into downloading adware.
Many versions claim to offer live streaming of international channels that broadcast adult content after a certain hour. This includes news, sports, and entertainment channels that are geo-restricted elsewhere. 18 tv app
If your search for "18 TV app" is for sexually explicit material (pornography), there are legal, safer, and professional platforms that respect privacy. A: No