IBook Allowed on ALL Devices

I will keep it simply. IBook/ Apple Books should be allowed on ALL devices so consumers can enjoy reading across multiple platforms. This will increase the flow of patrons to the Apple community if it is opened up for enjoyment. Please remember you charge consumers, all books that are purchased belong or should belong to the consumer, right???? Why would you hold products that was purchased hostage. You allow for Apple music and Apple TV. I am not sure why you would hold information, purchased hostage????