Governments keep control on people by the usage of force, but corporations have the means to control people by the use of pleasure. You might not get in jail but if you're not allowed to go where you want/do what you want/talk to who you want, if your life revolves around a single thing and that is removed from you, would you still do it ?

This comic about Orwell's and Huxley's vision of things really lays it in simple terms (https://twistedsifter.com/2010/06/the-saturday-strip-week-13...). The source is, of course, very interesting to read.

How can you be sure - if they almost become quasi-goverments - they will surely have quasi-law-enforcement?

A ban by facebook could literally be lifethreatening?

While true now, remember that companies used to own armies[1] and territories[2]. Their motives -- shareholder profit -- have not changed. They do and will strive to grow their power.

It's not a stretch from today to imagine living on company-built cities with private security, paying rent and utilities to the company, with contracts and EULAs serving as laws in all but name.

[1] https://en.wikipedia.org/wiki/Dutch_East_India_Company

[2] https://en.wikipedia.org/wiki/Company_rule_in_India

They do though.

Don’t be so sure.