I had a brand new computer that i built at the start of the year. 100% new hardware. Brand new install of windows. Installed Steam, installed CS:GO. And I was unable to play because Steam flagged my system for cheating. The fix was to run some random steam exe found in the steam install directory. I guess it caused Steam to re-scan my system?

Not the same level of frustration as a permaban. But I was pretty annoyed that I had to jump through hoops on a brand-new system. Really weird.