Although I do agree with the majority of what you said, I don't think the studios have rights to dictate character treatment, exclusion of inclusion of certain characters or the narrative in general for that matter. Nothing good has ever come out of this approach. Just because you're an oligarch who owns a world class soccer club, it doesn't automatically make you a coach. I do hope Warner Bros learn from their mistakes. Just look at their story. In the 2000s they gave Chris Nolan a ton of money, basically granting him unlimited creative freedom. The result? One of the most well-received and financially succssful trilogies of all time. So, what do they do next? Instead of cultivating that same approach that alllowed that to happen, they said "No, screw it. The audience just wants to see as many familiar heroes as possible". So they ditched the creativity, ditched the smart and thoughtful approach to storytelling and opted for a quick and easy route. The result? A giant loss of money and even bigger loss of fan respect. Let's hope Joker and Batman are the indicators of a creative reconsideration rather than just lucky coincidences.

Complaining about "Toxic" behavior in Fandom outrage is always a smokescreen for studios to cover themselves, never take it seriously.