What? Those free users are practically providing free infrastructure testing. Those low-no profit margins are hiding a lot of stuff underneath. Intel and Cloudflare are famous for reaching scale by using cheap/free end of the market to expand and solidify their positions.
Speaking more to the torrent and zombie bot farms, and the abuse of free dynos.
For legit freemium users who to "try before they buy", indeed... it's a sad day for Heroku to lose this audience.