If Google is so big that 0.00001% loss of revenue doesn't register for them, they are surely big enough to spare 0.00001% of total engineering time to fix that loss?

In fact, I hear that as a common complaint that when working as an engineer at Google most of the time you are just making some system fractions of a percent more efficient.

Just to be sure, I am not saying that either your premise or the statement you are inferring is wrong. No opinion on that. I'm just saying that your premises don't lead to the conclusion. (But your conclusion might be right for other reasons.)