any business that wants to use gpl software has a problem.
It's not that gpl is bad either, or that it can't be used for commercial purposes, it's simply that the traditional business model doesn't include giving anything to anyone else.
So like I said, google "mit vs gpl" to get countless articles and discussions explaining all about that. That is the answer to "what's the problem with gpl here?"
This project is 0bsd not mit but mit will yield more hits, and is the same fundamental issue.