That was FaceTime, and it was because it was a peer-to-peer protocol. Then Apple was sued over a patent and had to implement a more normal design, where it pay

That was FaceTime, and it was because it was a peer-to-peer protocol. Then Apple was sued over a patent and had to implement a more normal design, where it pays for and runs the servers. Apple didn't want to run the servers for Android people to talk to each other.