You need to think it in a different manner. When you have AGPL code, then it benefits mankind more than corporations. There's a Harvard report on value of open source to society based on how much money corporations put in.

Today linux is working nicely on desktops (even though it's not the year of linux) and is heavily dominated by corporations. The parts where linux doesn't do well are exactly parts without corporate support.

Software is becoming complex enough that it's not possible for a single company to just even maintain a compiler let alone an office suite. Its perfect ground for either one company having monopoly or an free software (not open source) being a base for masses.

That’s not an example of open source that doesn’t benefit corporations. Linux is amazing for corporations.