That's why only gpl like licences is viable for opensource, because look at freebsd, Apple uses it, Sony uses it, and many others, but did they contributed back as much as Google and others did to Linux? Nah
Not exactly, ctrl+click is opening separate tab from clicking on link as middle click does, other functionality is not confirmed and yes, it might be windows/Linux thing as i didn't tried other PC OS
Rigid bra be like