Google Messages Getting Cross-Platform End-to-End Encryption with MLS Protocol

Google has announced that it intends to add support for Message Layer Security (MLS) to its Messages service for Android and open source implementation of the specification.
"Most modern consumer messaging platforms (including Google Messages) support end-to-end encryption, but users today are limited to communicating with contacts who use the same platform," Giles Hogben, privacy engineering

android consumer contacts encryption end end-to-end google google messages implementation message messages messaging open source platform platforms protocol security service support today