It's usually up to the publisher whether their ebooks are DRMed or not, the Kobo store (eg) uses DRM also. You can, of course, read non-DRMed eBooks on a Kindl

It's usually up to the publisher whether their ebooks are DRMed or not, the Kobo store (eg) uses DRM also. You can, of course, read non-DRMed eBooks on a Kindle, if you can find them.