Because percentage of investment indicates how central Linux is to their business. If Linux disappeared overnight, Google would find another way to sell ads, but RedHat would disappear.
It's a reasonable proxy for things like long-term commitment and commits across the stack (e.g. audio and video, not just network and disk).
It's a reasonable proxy for things like long-term commitment and commits across the stack (e.g. audio and video, not just network and disk).