Yet, as I hope you’ve learned from this post, every existing blockchain network, including the Bitcoin network, can freeze the funds in an account, as long as all the block producers on that network agree to do so. All they have to do is agree not to include the transactions into their blocks.

You are comparing Bitcoin to Steem which I think is a bit misleading considering the scale of both chains and different mechanisms they operate on. It's not that easy.

If something similar to SegWit (theoretically speaking) would happen on Steem, the implementation would be instant because there is a huge centralization of power. This means a simple culture war could lead many people to lose their stakes by a HF/SF.

However, on the Bitcoin chain, SegWit transactions are yet to reach 100%, even after years of its implementation.