There's also a decent number of webnovels (sometimes perhaps too long to be a novel, may or may not be split into distinct books) without a unifying platform, j

There's also a decent number of webnovels (sometimes perhaps too long to be a novel, may or may not be split into distinct books) without a unifying platform, just individual per-book sites - four that come to mind from different authors are Edally Academy, Practical Guide to Evil, Worm, and UNSONG (all different flavors of fantasy/sci-fi). At least the first and third of those are by authors who have also done other things with their own distinct sites. The sites often have links for works by other authors, as well. It might be a bit harder to break in that way than through a platform, but it's still much easier than print publishing.