This is one of the funniest things I've seen in a long time. The company that has had 47 different messaging apps and changes them weekly trying to lecture the company that nailed it first time. Grow up Google.
Google can't act indignant that Apple isn't following their lead after they tried, and failed, repeatedly, to follow Apple's.
Google wanted a proprietary messaging service like iMessage for Android. They failed. They failed so many times they gave up and became champions of RCS, a standard the carriers were limping towards supporting.
Google pretending they're now champions of open standards and Apple is the big-bad meanie is ridiculous.