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Nothing Phone builds a blue bubble iMessage bridge while Google and Apple fight over RCS
(www.androidcentral.com)
This is a most excellent place for technology news and articles.
The reason they're moving forward with this is because if Apple tries to sue, it could make a case for Google that Apple is trying to take control of messaging in the United States. If they don't sue, should Google come after them down the line Apple can say "we're aware of 3rd party iMessage and decided to not take action to increase interoperability" yadda yadda.
That's my guess anyway.