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Why is Google allowed to remove purchases from our Play Store accounts without telling us?
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
The difference is that a hostile takeover can't happen.
Unless the founder still owns a majority of the shares, you can take control of a public company without needing the consent of the board (and CEO, founder, etc)
I know it can happen, but that still makes a difference between public and private companies. That's one risk less.
Especially for Valve which is a very desirable company for their position as de facto PC games online store.