https://github.com/wixtoolset/wix?tab=License-1-ov-file#read...
Also, the exact wording is:
"a EULA on binary releases (including those published to GitHub and NuGet.org) requires payment of the Maintenance Fee"
I'm not a lawyer, but doesn't that mean that I can compile the code myself to circumvent the Maintenance Fee, and give the binaries away for free?