@mily,
It seems like you are predisposed to be prejudiced :)
This is not the same as potayto or potahto, but more like the generic apples and oranges.

If I as a person work for Microsoft, then when I give my individual contribution, I have to put the name of the company I work for. So when Tom, Dick and Harry who also work for microsoft feel a need to contribute personally, they also have to put in the name of the company they work for. So that's the number that is tallied up as Microsoft Contribution.

Microsoft as an organization cannot contribute directly. The companies that you mentioned Alphabet, Apple, Amazon, Intel - it was their employees who made those individual contributions! 

What microsoft can do however is become part of a superpac or create a superpac and contribute from their own bank account as much as they want. And that's where $millions come into play.

You are confusing individual contributions to corporate superpac contributions my friend, and thus comparing apples to oranges :)

Look at Khaobadi's chart above where Bernie received less than 0.1 from Superpacs.