TBH, enforcing maintenance fee for anyone who makes revenue feels unfair.
There are other open-source libraries that has dual-license with some kind of GPL variant and a commercial license. but there's at least some threshold.
Imagine indie developer or someone who wants to try and create something but without much revenue (eg 1k / year). so 10% of your revenue goes to the installer of your product...
I'm all in sponsoring open-source and investing in software but part of being sustainable is making it accessible. so maybe that indie developer who used WiX for their indie project ended up going to 100k/year and now can contribute. But if originally it was capped, they might choose other solution that fits the "indie" tight budget better.