Not endorsing any copyright violations here, but I'm sharing my insights from yesterday when I tried to create a PDF of a non-mobile enabled resource, how to increase the limit of the 100 pages restriction.
My idea was to fit more content onto the pages, so that even when the 100 pages limit persists, you can still export a larger portion of the resource.
1. Reduce the page margins. Reducing from normal to small allows about 20% more content on a page, so what used to be 120 pages, now fits on 100 pages.
2. Export the resource in two columns. That allows about 10% more content (depending on the number of images and page breaks it might be a bit more or less), so we're at about 132 pages, and the resulting document is still okay to read on medium size screens.
3. This step doubles the amount of content you can fit on 100 pages, however, that goes at cost of comfortably reading it on small and medium size screens. Export to A3 instead of A4, and set the number of columns to 3. You can now fit about 264 pages onto 100 pages!! I have no 10 inch device to test whether it's still possible to read, but on a 14 inch screen it looks good. So it might or might not be good on an iPad screen...