If you were on Mumsnet when the game came out we discussed the whole saga.
The TAs made Hogwarts Legacy the biggest selling game in the world. It was always going be successful, BUT in the run up to the game and at its launch the TAs gave it millions and millions in free publicity. All of twitter youtube facebook etc was talking about it. They tried to cancel streamers who played the game but that boosted their views.
Loads of media outlets published articles about the arrival of the game with journalists always suggesting that JKR was wrong. Yet none of that mattered.
They thought telling everyone that the game was wrong would end it, but instead they made sure everyone on the planet heard about a game where you could go to Hogwarts. For the the average person that sounded AMAZING.
Sure a bunch of people went out of their way to buy it to upset TA types. However that was not why it sold as much as it did. It succeeded because people worldwide love Hogwarts. All they needed was to hear it existed and people went wild.
The TAs made JKR millions of dollars in sales because they hate her so much. All they needed to do is not post online about the game when it came out. Don't make Harry Potter trend on tiktok, twitter and Google, but they could not do it. It isn't even about her opinions really it was about the fact she was a woman saying it. Remember loads of right wing politicians, Muslims, Catholics etc tend to think the trans stuff is wrong, but the TAs don't even get as obsessed with that fact.
More than that the success of the game made Warner Brothers commit to the TV series which will make JKR even richer. It will have HUGE extra publicity with articles like this.