Not every user monitors every single goings on with their software. There is also no mention of the software becoming proprietary on the October CMS website. Users shouldn't have to keep tabs on their free software for fear of it becoming proprietary due to a hostile takeover.
It mentions their move to paid only on the homepage.
Paid doesn't mean proprietary.
No, but you could click one link and read a short blog article - the word proprietary is just a few hundred words in.
Calling this a hostile takeover is being extremely overdramatic. There was a fork.
[0] As in "developers using the CMS"; for actual users of projects based on the CMS, absolutely nothing changes.