Question about tolino shine 3

I have the device: I can easily (via USB cable, via cloud or directly via the Tolino web browser) load any purchased books or PDFs or books borrowed from a library onto it. However, the integrated shop is Orell Füssli, i.e. if I want to buy a book via the shop on the Tolino, then it is with Orell Füssli. Likewise, the login for the cloud is via the Orell Füssli account, i.e. it is almost mandatory (the sentence before says "The tolino shine 3 cannot be linked to the Weltbild account").