Publishers Weekly also covered it, ladling on praise for the founders. But isn't this model close to what Entangled does? Unless they've changed it, theirs also is no advance, and everybody involved with the book editorially gets a royalty share, and the books are chosen for their trope / best seller quotient.
Plus, Entangled just brought on a batch of indie writers who already sell big in ebooks, with the plan to give them physical bookstore distribution. The dream of many a successful indie: "Look, Ma, I'm on the shelf at Barnes & Noble!"
The model is not exactly the same. From what you say, Entangled gives everyone a royalty share (sort of like Book Trope used to do). Authors Equity hires freelancers (more upfront cost than royalty share, less than having all those people on permanent staff, and more flexibility to hire people based on the nature of the project).
Both seem to have distribution deals. Authors' Equity has Simon and Schuster; Entangled has Macmillan.
In looking at the two, Entangled has been around, has a track record and a fully developed website. I'd be inclined to go with them first--except that their emphasis is on romance. They have twelve imprints dedicated to some kind of romance, from YA to erotica. One imprint is dedicated to fantasy and science fiction...romance. That leaves one imprint for picture books, one imprint for YA in various genres (though a romantic subplot is required), and one for mainstream thrillers and women's fiction (an odd combo, but I'm kind of betting they want to see romance in both). Some of the imprints also mention feminism and female empowerment.
In other words, some writers would be a good fit, but a lot wouldn't. Most of the time, I have romantic subplots (bot not always HEA). I have a variety of female characters, most of them strong. Nonetheless, I'm inclined to think I'm not a good fit.
I also noticed that most of the author names are female or indeterminate. This needn't reflect on the publisher's selection process. A romance imprint is probably going to get a lot more female submissions.
For someone who writes in a genre that fits well, Entangled looks like a great place to submit. Its books look appealing, and it publishes frequently. I only checked one of the books to see how it was doing. It was a 2019 book that still has good Amazon ratings (and a ton of reviews). The cover is beautiful (as they pretty much all are), and the interior looks professional (though the paragraph indents look a little small to my eye). The book is available in ebook, paperback, and audiobook. It's both in KU and available at Barnes and Noble, Apple, and Kobo. (That alone is worth the price of admission, no doubt a perk of being distributed by Macmillan.)