Independent of the Harry Potter thing, there was a leveraged buyout of HBO (the premium cable movie channel with a reputation for first rate films and TV shows -- arguably some of the best shows in American history are from there), in which the schlocky reality show company (that used to be a science-focused channel) Discovery bought them out.
To reduce the huge debt they're now saddled with, the new company has been cutting shows left and right, cancelling completed movies like Batgirl and even yanking popular and completed shows off the channel.
Within a year, they've gone from being the obvious best streamer (after working out some early pandemic kinks with their app) to below average and they're apparently not done with the madness yet. Next up, they appear to be about to remove the HBO name from their app, meaning it'll just be called "Max."