Let us assume a miner decides to roll back segregated witness on what is presently the most valuable chain.
There is a non-zero chance of this happening- one which Core-ists seem never to discuss as a looming concern or even a possibility. In fact, it is generally waived away as BCash FUDsterism.
Fake nonsense and FUD. This would be a HF and my node, just like anyone elses would reject it and the miners would lose their money. Tagged you for posting lies.