Editing is a lot work, and their efforts are appreciated. But most of that involves the application of existing rules (curly quotes etc.) and therefore doesn't meet the creativity standard of copyright.
I guess the texts are out there anyway, and it doesn't make much of a difference. But I'm reminded of the art world, where many a painting is long out of copyright, yet only the Museums have access and the insist setting up a lightbox and taking a photo is a creative endeavour worthy of protection from the prying eyes of the non-paying public.
> [T]hose who are hesitant to use photos of works that are in the public domain […] should know that under the law if the image is “slavish,” a mere reproduction, a plain unadorned exact image, they can use it and do not have to pay anyone a licensing fee.