Skype still works over a YEAR after shutdown! Microsoft has killed off the auth endpoint and blacklisted the Skype client IDs, but you can still get away with modifying the app and intercepting the login traffic. it's a bit broken but you can still message/call people :)
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did you know that you can IP grab someone by just FaceTime calling them (so having their phone number or iCloud email) with the built-in privacy report feature this leaks public and private IPs, apple's "private relay" is not affected (but that's an iCloud+ feature)