Segwit2x attempted to replace the existing Bitcoin software and network with something the entire current development team thought was a terrible idea. It relied on the premise that the reason almost every person who had experience deploying changes to Bitcoin opposed it was because they were part of a secret conspiracy to cripple Bitcoin. The software was developed by a single guy, was to be deployed on a ludicrously tight schedule with no real code review, and had bugs that would've caused chaos if t wasn't cancelled at the last minute due to opposition. Hostile takeover seems accurate.

Oh, and BitPay (the payment provider Steam used) tried to trick users into switching to it via a blog post telling them they needed to upgrade to it because of Segwit and their money was at risk if they didn't. Every user who followed their advice will now have a client that doesn't work.