companies like Facebook, Apple and Google
I would put Microsoft first and foremost with a global desktop OS market share at over 90%. While they free you to use a lot PC hardware you want (mostly after they use their power to turn the screws on manufacturers to not bundle Linux), their monopolistic control of the world's OS experience is as feudal as it gets. Malware spreads like crazy because of the lack of OS diversity in the PC market. With the flick of its wrist, Microsoft affects hundreds of millions worldwide.
This is not to say I don't think Facebook, Apple and Google belong on that list, but I found Microsoft to be a glaring omission considering it's the top feudal lord in the business. When Microsoft leaves holes wide open in your PC for others like the NSA (and God knows who else) to exploit your personal computer and business computers and that affects over 90% of all PCs in the world, that puts them at the top of this list.