I have heard a lot about these apps. Especially in the Asian side of the wotld. If I am not wrong this was even covered by BBC news at one point of time.
You can find several videos on YouTube by just searching rent a Girlfriend/Boyfriend. There is a channel called Asian Boss who covered the story in a little detail. You can check that out.
Whoa! Crazy! hahaha I didn't know it's that common.. and checked out the channel. That's interesting one to learn stories! Thanks!! :D