The "Why did my account get banned after verification?" section gives some reasons:
- Repeated violations of our Usage Policy
- Account creation from an unsupported location
- Terms of Service violations
- Under-18 usage
- Repeated violations of our Usage Policy
- Account creation from an unsupported location
- Terms of Service violations
- Under-18 usage
So identity verification is basically a canary that your account is about to get banned, or is on the chopping block. At that point you're better off abandoning ship rather than handing over your ID.