> At some point AI becomes important enough to a company (and mature enough as a field) that there is a specific part of legal/compliance in big companies that deals with the concrete elements of AI ethics and compliance and maybe trains everyone else, but everyone doing AI has to do responsible AI. It can't be a team.

I think both are needed. I agree that there needs to be a "Responsible AI" mindset in every team (or every individual, ideally), but there also needs to be a central team to set standards and keep an independent eye on other teams.

The same happens e.g. in Infosec, Corruption Prevention, etc: Everyone should be aware of best practices, but there also needs to be a central team in organizations of a certain size.