At least Florida’s SB 868/HB 743, “Social Media Use By Minors” bill isn’t beating around the bush when it states that it would require “social media platforms to provide a mechanism to decrypt end-to-end encryption when law enforcement obtains a subpoena.” Usually these sorts of sweeping mandates...
It’s only a matter of time until someone reverse engineers it. I wouldn’t be surprized, if Windows’es NSA backdoors were already discovered, but were patched out before hitting news. Or maybe someone is keeping it for themselves.
If you ask me: I think it could be activated via either a magic string from a verified IP address, or a malicious update from Microsoft that just turns on some features. I also think the telemetry services might be part of that.