I guess I'm not smart enough to understand [edit: the hype around] this.

The license agreement doesn't change? But you don't get support unless you pay the maintenance fee? So if a user reports an exploit, Wix won't fix it unless the reporter pays the maintenance fee first?

Or if some corporate user has a great idea for a new feature, Wix will ignore it until a paying user requests it?

It seems obvious that this is nonsensical. OSS authors have always been able to pick and choose what PRs they accept or what issues get their attention. They have always been able to charge for support. How is this maintenance fee any kind of innovation?

I don't mean this as a criticism of Wix. I think it is awesome that they develop tools with open source licenses. And I think it is perfectly fine for them to charge support fees. Just like it always has been for all open source projects.

If a would-be contributor feels locked out, they can fork. This is not a new idea. Obviously, forking is a pretty big commitment that will require financial backing. So any rational party considering forking should also consider paying the author for their attention. Even if you have the pockets of an Amazon, it would probably be better all around to fund the original author than to set up a competing fork. Of course there will be the occasional LibreOffice, io.js, OpenTofu, neovim. If you can actually pull off a split like LibreCAD, more power to you. io.js made its point and made nodejs healthier.

This has always been a huge advantage to open source software. You can benefit from the community. You can contribute to the community (code, art, docs, money, ideas, whatever). Kudos to Wix for participating. Best wishes for their future.

The license of the source code doesn't change. The license of the official binaries (which the official nuget packages contain) did change.