Doesn’t Kobo use Adobe DRM? I don’t see how that’s much better than Kindle.

I have a bunch of books from both stores, and Google too. The downloading and DRM removal process was about the same for all of them.

You can charge for FOSS, but you can’t prevent the first person who buys your software from sharing it with everyone else for free.

Some GPL projects do it. If you find someone infringing, it’s easier to sue them if you have one copywrite holder instead of 100.