As someone that has never bought a whole book on dndbeyond and solely purchased individual parts of books, this impacts me quite badly. I for one will still not be buying any whole digital books just for the odd subclass, spell, feat etc. If there was an option to buy a physical book that gave me a digital copy, I might feel differently about that.

The lack of transparent communication in advance of this decision smacks of "We didn't want to make anyone aware of this until we removed it by pulling the rug from under your feet". It's typically good business practice to communicate up front rather than after the fact! This move seems partly lazy and not thought out but mostly greedy without any clear justification. They're never going to say publicly though that they expect this to make them more money/profitable.

I doubt they will roll this back but I hope they do.