It’s updated frequently, all you need to do is search for channels that constantly upload them.
That said, Yoruba movies are not the only films you could watch on Youtube, Chinese movies with English subtitles are also constantly being uploaded on Youtube. According to Hootsuite, YouTube has more than 2 billion logged-in monthly users, it’s possible to watch YouTube content without even creating an account which makes the number inaccurate. There is no doubt that YouTube has become one of the biggest video-sharing and streaming services in the world.