I'm waiting for the detailed analysis (minus the usual ad hominem) ...
You could've googled it yourself, but here you go:
https://www.cryptocoinsnews.com/antpool-now-mining-bitcoin-unlimited/
This is a mess in itself, but add other clients, such as Bitcoin Unlimited, and we have utter chaos. Alternatively, if non-upgraded miners are forced by easily sybilable upgraded nodes to upgrade, then we have a dangerous centralized point of failure as developers – who are just volunteers with no real stake – are given all the power.