in my experience no publisher that's producing many hits will make their stuff drm free, and for good reason. looking at the archive ( https://archive.ph/zPBbZ ), almost all of the publishers do not publish popular authors. it's just too easy to share the books. you can get tens of thousands of books for what, a gigabyte? without drm that stuff will spread like wildfire, but drm can easily be broken by those who know…
(And https://www.bloomsbury.com sells quite major "hits" like Sarah Maas, Madeline Miller and Ann Patchett, without DRM – doesn't seem to have hurt their sales.)