amazon on kindle is very convienient. But I don't want to support jeff bezozs, which is why I like piracy. Also amazon makes it really easy to pirate. You just send the pirated copy to you kindle email-adress, and amazon uploads the pirated ebook to your kindle. I have done this for about 10 years, and I like to image, that Jeff sheds a single tear each time I do this.

On the other hand there are many public libraries with a steam-like service. e.g. you pay your regular library fee (2€ iirc) and you can download all the books you want to your e-reader. The catch is, that you can only keep a certain number of digital copies at the same time for some reason. The other down side is, that the initial setup takes some time (but I guess that depends on the library? idk it was >5 years ago when I did some research in that direction).

If someone knows more about the public-library-ebook-service, please let us know.