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Steemit inc can't force a hardfork without the witnesses agreeing. I found this old post by @someguy123 - it seems to sum up the basics.

https://steemit.com/witness-category/@someguy123/seriously-what-is-a-witness-why-should-i-care-how-do-i-become-one-answer

Not forcing a hardfork and open dynamic collaboration are very different things.

True again...

Well, this is very, very old in steemit terms, and some of the numbers referenced are outdated.

It is, but it does explain the concept of witnesses. For a more precise idea of the latest hardfork you should consult the white paper.