I went the other way around. I used to mostly release GPL code, and then one day switched to MIT and never turned back. I've profited from code written by other

I went the other way around. I used to mostly release GPL code, and then one day switched to MIT and never turned back. I've profited from code written by others; others should be able to do the same under whichever license they prefer. There's a simpler way to address the problem outlined by OP: just refuse to consider binding software dependencies whose source you can't read. (It doesn't necessarily mean FOSS, as in I'm OK with paying to get the software; but I do want to be able to read the source code.) To me using such a dependency whose source code I can't read is just a non-starter.