Windows 8.1 drops extended support in 2023. Windows 7 already ended in 2020.
Despite this, 12% of windows users globally, and 6% of USA users, still use Windows 7. This is actually larger than the share who still use w8.1 (3% both USA and globally)
Why is continuing to use Windows past its support deadline dangerous? And if it is dangerous, why are there still SO MANY windows 7 users?
Simple reason is it will stop receiving security updates. Therefore any new vulnerabilities discovered or introduced by software will not be patched.