Yeah, I totally agree that
for the sort of problems that Google or Amazon faces, blockchains are a terrible solution. There are well-known best practices for scalable distributed computing, and blockchains are not them.
I'm equally convinced - and I suspect I disagree with most HNers here - that there are also some problems for which blockchains are the only solution - they just don't work with centralized data stores, mostly because nobody would trust a single entity to manage that data store. Google isn't even looking for those problems. In general, Google does not look for problems, it takes problems that everybody knows about and looks for solutions. There are thousands of entrepreneurs in the cryptoverse who are looking for those problems.
There was a time, early in its history, where Google was willing to take a solution - download the web and keep only the links - and then find the problem (search) for which it was the solution. And then they leveraged that solution into all sorts of other problems - webmail, navigation & directions, news, academic papers, video, etc. But the thing is that this is a risky business: most solutions in search of a problem don't actually solve anything, so the time spent solving them is wasted.