The thing is, you should not just rip out the embedded fonts without checking if they should be there or not. I've seen some eBooks where ripping out all of the fonts is not a good idea. Also, you may want to keep some fonts and rip out others in the same eBook. So any eBook with fonts should be taken on a case-by-case basis.
Most large eBooks are due to images. One thing you can do to reduce the eBook size is to Polish book and select Losslessly compress images. That removes the junk in the images without changing the compression. I cannot say how much space this will save, but it will save some.
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