Project is too small, from my understanding (I'm only a contributor, not a core team member). You can see from the contribution guidelines[0]:
Ebooks that are not clearly in the U.S. public ___domain. If it’s not on Gutenberg, we’ll probably decline it.
So we're basically piggybacking off of the copyright verification work we assume that PG has already done. This is one of the reasons I haven't started The Worm Ourboros yet--it's in Australia's Gutenberg archive, but not the US one.
With that said, their specialty is in the transcription part. If you try reading one of their public ___domain works on a Kindle, they're often full of formatting problems and typos, since the transcripts are sometimes sourced from OCR scans. I've known people who tried starting a free book from Gutenberg, but eventually gave up and bought the same e-book off Amazon for a dollar because it at least had a working TOC. That kind of sale saddens me greatly. The end-user thinks, "Ah, it was only a dollar, I got my money's worth," but the publisher has basically paid nothing for the work, adds a few hours of digital typesetting, and then makes 100% profit on the sale.
Standard Ebooks often uses the Gutenberg raw text as a starting point and then cleans it up. We have a set of tools used for the initial cleanup process[0] that handles pagination, TOC generation, and some other basic "modernization" steps. The texts are then proofread and edited to conform to our style guide[1], which aims for maximizing readability on modern e-reader devices, as well as adding semantic meaning to any text markup. You can look at the guide for producing such a book to get a better idea of the process.[2] The end result is a free, public ___domain work which looks and feels like a professional production.
Fantastic comment, thank you for your efforts (and the rest of the folks at standardebooks.org). I haven't looked, but I'd ask that whenever possible, final artifacts are also uploaded to the Internet Archive.
[0]https://standardebooks.org/contribute/accepted-ebooks