[snowwrestler]

You didn’t waive or assign copyright but you did “grant Y Combinator and its affiliated companies a nonexclusive, worldwide, royalty free, fully paid up, transferable, sublicensable, perpetual, irrevocable license to copy, display, upload, perform, distribute, store, modify and otherwise use your User Content for any Y Combinator-related purpose in any form, medium or technology now known or later developed.”

So, with a license like that, they can legally choose to keep showing your comment if they want to.

That said, I think dang will help delete things if you email to ask and have a good reason. I’ve done it with a couple of my comments.