It almost feels like writing about this is exactly what the attacker wants: Free validation and advertisement for exactly what their botnet can do
replies(2):
A: Cloudflare is feeding the trolls because they think that they are invincible. Or: These post-mortems don't establish any proof that the attack was successful, especially if they are covering DDoSes that were barely even noticed by the public until CF publishes a blog post 1 month later -- so it's actually embarrassing for them and hurts their ability to market botnets for rent, at least once they no longer have the literal world record.
B: Cloudflare is feeding the trolls for free testing scenarios to improve the mitigation
C: The trolls don't really care if you feed them, large DDoS is something that's happening all the time anyways