Late night thought :

Google is a search engine company having with an operating system(Android) as a side product.

Microsoft is an operating system company having a search engine (bing) as a side product.

Google is an advertising company that hides behind Alphabet name.

Microsoft is corporate leasing company that also makes software.

Microsoft started by building developer tools, specifically basic interpreters.

They jumped on the os train when IBM needed an os for their personal computer (PC).

Google started as a search engine and jumped on advertising to monetize their users instead of being bought by someone that would have done the same.

Both diversified into many other areas over time.

Don’t forget Microsoft is a company which has between their main products visual studio and visual studio code. There is no need to say more.

Amazon is a courier company and having cloud infra as side product.

@MightyCutie They started by selling books.