You say “support” like the moment they stop it, OS cease to work. OSX Leopard is usable for most of tasks. Lot of people still running Windows 7 and Windows XP without any need for “support”. Windows 10 will be even better without constant “support” reboots. Can’t say this for Windows 11, as it so tightly stuffed with spyware and online integrations, it might just not boot if MS plug some server switch.

"Support" can mean a lot of things.

Apple does not provide security updates for Catalina, which was released 3.5 years ago. People would be crazy to run unpatched OSes for any use case involving the internet or wifi.

I would not want to run an unsupported OS of any variety.

Modern web browsers will stop working on older operating systems - so will other apps.

Not only is it a massive security risk, but it will simply become impractical for most users.

Besides, if you're afraid of the TPM vulnerability described in this article, you ought to be more worried about running an out of date OS!

Windows 7 is only starting to get obsoleted now : while Microsoft is still updating it with critical security fixes, Qt and Chromium dropping it is pretty much the end for non-legacy usage. (Good bye Windows I guess...)