> The problem isn't "corporations", it's capitalism.

well, other systems were tried and were worse (feudalism, communism etc)

in practice capitalism with some regulations is better than known alternatives

> Contributing to open source software or commons like Wikipedia definitely is questionable

what is not questionable then?

Absence of evidence isn't evidence of absence.

Worse, you mistake the bounds of your personal knowledge as the borders of the world.

Even if there was no currently "known" alternative, the proper course of action is to research that and find one?