An acknowledgment that it costs some small amount of money to host a website for the code, or that you may from time to time want to hire someone to do something specialized (design a logo?) and need to raise some amount of money for that to happen.
By world-wide standards (though not necessarily by Silicon Valley standards) I am fairly wealthy and thus could afford to support a completely commercial-free open-source project out of my professional salary. And this would make my project liability-free in the EU. But someone else, who didn't grow up in the USA at a time when university tuition was cheap, would not be able to do the same and their otherwise-identical project is subject to legal liability.
How is that fair? Isn't this just going to further concentrate open source contribution and leadership in a handful of rich countries (that are mostly not in the EU)?