It might be a pipe dream but I'd like to see some sort of checklist for dev companies using hard-to-bullshit objective criteria to highlight that they either have a good culture or that their culture is toxic.

I remember many years ago companies used to advertise their "joel score" (not quite the same thing but related) to attract employees.

This is something which I think investors could also use as an indicator of company quality.

A lot of cultural problems also have quite easy fixes they just require shining a light on specific abuses of executive power which simultaneously hurt employees and destroys shareholder value. There is a lot more of this than I think people realize.