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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.
Although true, it was added to make iMessage (and every other service) more secure, not just as some sneaky way to keep iMessages off android devices.
It's really not necessary though, it's just a justification after the fact. There are several secure e2e apps available without utilizing a special chip to house that data, even Google has e2e with their RCS implementation