I don't see any controversies mentioned on https://en.wikipedia.org/wiki/Market_maker https://en.wikipedia.org/wiki/Market_maker. https://en.wikipedia.org/wiki/

I don't see any controversies mentioned on https://en.wikipedia.org/wiki/Market_maker https://en.wikipedia.org/wiki/Market_maker. https://en.wikipedia.org/wiki/High-frequency_trading https://en.wikipedia.org/wiki/High-frequency_trading mentions some controversies about high-frequency trading in general, but none specifically about market making.