cross-posted from: https://piefed.world/c/tech/p/1246200/pdf-a-hacker-s-arrest-reveals-microsoft-can-track-users-ip-history-even-with-vpn-full-we

You can read about it yourself here on page 12 (or page 8 of affidavit), then page 33 and down (page 29 of affidavit)

First one to notice this: Security researcher, VX-Underground.