What happens if you install Windows 10 without a product key?

Related questions

1. What is the difference between OEM Windows 10 and retail?
2. What is OEM product key?
3. How can I find my product key?
4. Can I use product key twice Windows 10?
5. Can I use an OEM key on another computer?
6. Can Microsoft Office be shared?
7. Can I find my product key using product ID?
8. Can I reuse a Windows 10 product key?
9. Which is better OEM or Retail?
10. Is my product ID my product key?

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17. #advantage