I recently read Contact(the book by Carl Sagan, still need to watch the movie), which features a tech billionaire who built his wealth doing exactly that. He developed a chip that could block TV commercials, and later one to filter televangelists as well.
For a book that was published in the 80s and set in the late 90s, it’s prescient in a few very specific ways. We weren’t exactly communicating by Portable Telefax in 1999, but adblockers were not far away either.