There is no ethical consumption of Harry Potter. And not in the usual "no ethical consumption under capitalism" way. In the "your fandom is now comprised of hate symbols" way.
JKR explicitly said she considers anything Potter-related, even fan-made, endorsement of her politics. And every time you engage with this franchise, you signal to the industry that there's still money in it and they should keep pumping out content from full-cast audiobooks to book box partnerships.