This isn't some backseat driver telling DO how to run their event better. This is literally someone who is supposed to be benefited by the event (an open source maintainer) who is saying the event has negative value for them. They have skin in the game, they're doing this for free compared to the DO employees who are being paid to administer the event.
Why? Open source has worked perfectly fine before this and maintainers are saying it's a net negative. So why not stop? Because DO doesn't get a PR campaign anymore?