Do we know that the people laid off by Google, or advocated for layoffs by this billionaire, don't include the cleaners, gardeners and people serving food in the free canteen?

I think painting this as a "capitalists vs the left" thing is reductive and unhelpful. Personally, speaking as someone who Americans would probably consider extreme-left, I very much agree with your second paragraph, but I don't see this as "capitalism vs the left", I see it as the elite rich abusing their position to the detriment of everyone else. A story as old as time.