Just tried with my win10, msinfo32 says that secure boot is enabled.

win10 is not revelant anymore.

What about win11? And for instance the game anti-cheats (more anti-open-source than anything else though...) which require TPM/secure boot?

Not my personal test, but looks like it's perfectly possible:

https://burakberk.dev/complete-guide-enabling-secure-boot-wi...

Not win11. It has to be explicit with win11.

That said, this shows the sabotage of dual boot by microsoft making it hell, this is proof, and thinking that all motherboard BIOSes will have properly tested secure boot configuration is a dream.

What do you say to this one?

https://medium.com/@ethanppl/dual-boot-windows-and-ubuntu-wi...

AI or very very shabby with weird things?

Seems legit to me. Anything in particular that looks off to you?

Everything...

Seems correct to me. I feel like you’re not engaging in good faith.

ok, AI.

No — I can assure you that I am a living, breathing human being.

Jokes aside, Windows 11 can be used with Linux on the same machine, Secure Boot on and off. Why does this fact seem to be so unacceptable to you?

I see. Unfortunately I don't have Win11 to test with.