Nicehash excavator doesn't charge any fee, so they don't make more money from removing Phoenix.

"Excavator is a very lite NVIDIA mining software developed and signed by NiceHash. It delivers competitive hashrate performance and most importantly it has a 0% fee, unlike other 3rd party miners which generally charge a 1% development fee!"

https://www.nicehash.com/blog/post/what-is-excavator