Actually, I got the notion from Stallman's original post 'The Javascript Trap' [1].
"Finally, we need to change free browsers to detect and block nontrivial nonfree JavaScript in web pages. The program LibreJS detects nonfree, nontrivial JavaScript in pages you visit, and blocks it. LibreJS is included in IceCat, and available as an add-on for Firefox."
However I am opposed to that call for action given it's an all-or-none implementation. I feel it's the role of each country to regulate, which is why I expressly suggested it as a configuration option (ideally it could be enforced at the browser level country by country and if not then user by user).
It seems like the thesis here is that whether or not "non-trivial" Javascript (which is just about all Javascript in the wild) should be trusted depends on the presence of an explicit GPL license. If so, that doesn't seem like a reliable heuristic for a script blocker to me.
I'm pretty sure it would be similar to ad-blockers. The initial implementations are trivial and easily circumvented, but as they evolve they become more useful overall.
Plus note that I was just suggesting that it would be more effective than a social movement with 'ethical repositories'. Just imagine if the ad-blocker devs tried the same strategy...
