We did. If you are posting here, that means you've explicitly stated that you read and agreed to Y Combinator's TOS. Which include this clause:
> you hereby grant and will 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
And people are still fine with this apparently, otherwise they wouldn't use the service anymore.