You are literally complaining about advertising spam.
Also.
I want to see your proof. That there are 100 accounts specifically spamming and what characters have spawned from them to post. That Blizzard isn’t doing anything at all behind the scenes and that there hasn’t been any action whatsoever on each of those 100 specific accounts.
You lose credibility when you start with hyperbole. You have no idea what is going on behind the scenes, and you’re not entitled to know that. We never know what actions are taken, it’s between Blizzard and the offending account. You’re not entitled to anything more than server access. That is all that you’re paying for, so please stop harping on what you think your monthly subscription pays for.
But again, all of the back and forth aside - you have no other paths open to you beyond right-clicking and reporting. Move on from there. If you really are so upset over it, you have the option of enlisting an add-on. If you don’t, that is your choice. No one is forcing you to use it, but it does help with the quality of life while Blizzard works on things from their end.