Because the Bitcoin Unlimited is a fork from the bitcoin itself. It's mean if that will disrupt the crypto community.
We do not need the Bitcoin Unlimited coin. It will be worthless in the future.

There will be BUcoin and it means if there will be the hardfork for the bitcoin. With the bug on the bitcoin unlimited and a lot of the people are being scared if the hardfork will fail.

They can't drive the hardfork for well. The both are the opposite things.