Krinn does show up, and he’s furious that they killed Sneed, who was essentially his brother even though he is a Vulcan and the latter was a Ferengi.

Source: https://collider.com/star-trek-picard-season-3-episode-5-recap/

One easily-missed detail involves the doorways into a Ferengi home.

Source: https://gamerant.com/star-trek-ferengi-doors-culture/

The Ferengi from Star Trek were an integral species in Deep Space Nine, but what exactly were their infamous Rules of Acquisition?

Source: https://screenrant.com/star-trek-ds9-ferengi-rules-acquisition-explained/

To not adorn their ear, or hinder them in any way, was most likely a superstitious belief that they would function better without it, and the garbless Ferengi would have better financial luck.

Source: https://gamerant.com/star-trek-origin-ferengi-headgear/