I thought a big problem with these types of wheels was dealing with the added unsparing mass?

Bookshop.org just recently added ebooks, and I believe they have a UK store, for anyone trying to buy ebooks in a more ethical way. It allows you to select a local bookstore of your choosing and support them when you purchase books. They take a small fee to cover their warehousing and shipping I think, but pass along a lot of the profit (80%) to the local bookstore. They’re a certified b corp and their bylaws say they can’t sell to a major retailer (eg amazon).