Android Rust
https://www.evernote.com/shard/s346/sh/afebb3e0-5c85-43f5-8d5c-a84cff82a197/92d9e3f1a51620d30ef8972e06e2ded7
But, the story for mobile OS is rather different. Many portals offers a huge range of mobile mmorpgs. These can be just a few brands. These would be just any few people.