[alpark3]

You're thinking of Optiver's The Hammer, though every HFT firm has basically done or is doing something like this. [1]

Jane Street's version of this was absolutely intentional.

[1] https://www.reuters.com/article/business/high-frequency-trad...

[pclmulqdq]

Ah, my mistake. Optiver was The Hammer. The tower regulatory action was for spoofing.

https://www.cftc.gov/PressRoom/PressReleases/8074-19