Not to mention the nine year gap since they killed off support for an actual standard in all their products (XMPP).
Nearly a decade and a dozen failed messaging products later, now they are shaming others for not being interoperable with their preferred spec?
What you want is for everyone to support whatever messaging protocol Google is pushing today. There have been a lot over the years and it seems like RCS won’t be the last (it has its flaws — serious, fatal ones, IMO).