Steam asks for admin to be installed and asks for it again to install more features related to screen sharing.

To me, any app that asks for admin is suspect.

Admin privileges aren't the same thing as a kernel-mode driver. Steam does require admin to be installed, but it does not install a kernel-mode driver.

are you sure about that? anti cheat stuff is pretty invasive these days

per microsoft admin to kernel is not a security boundary

Root and kernel are different levels.