It does not. These companies do not even work in the same problem space. Amazon works in retail, cloud, book publishing, etc. Microsoft maintains their own cloud as well and a complete operating system.
At least compare it to companies with similar businesses. I would argue twitch seems closer. I think they had over 1000 employees. You would have a better point with that comparison if you would want to make that argument.
>>almata+(OP)
I'm going to say more or less the same thing in a different way. As you scale up to do more and different things, your efficiency at some level is going to go down. Maybe way down.