Regarding your link to the article on pizza arbitrage,
DoorDash and Pizza Arbitrage (2020) - https://news.ycombinator.com/item?id=40806356 - June 2024 (147 comments)
DoorDash and pizza arbitrage (2020) - https://news.ycombinator.com/item?id=32086170 - July 2022 (230 comments)
Doordash and Pizza Arbitrage - https://news.ycombinator.com/item?id=23216852 - May 2020 (518 comments)