From the YC legal page >Except as expressly authorized by Y Combinator, you agree not to modify, copy, frame, scrape, rent, lease, loan, sell, distribute or cr

From the YC legal page >Except as expressly authorized by Y Combinator, you agree not to modify, copy, frame, scrape, rent, lease, loan, sell, distribute or create derivative works based on the Site or the Site Content, in whole or in part, >In connection with your use of the Site you will not engage in or use any data mining, robots, scraping or similar data gathering or extraction methods. Who owns the posts that you are trying to profit from?