Mistral specializes in tuning their models by customers. That and self hosting are like 90% of their business, they aim straight at what Europe would like to get (that fit needs, economic and regulatory).

So the goal is probably to be able to tune this basis to your ruleset.

As an addendum: US-style moderation is a big issue in europe and notably in France, with a very different touch on what's ok and what's not (obvious differences: hate speech and sex). Mistral is an european company with a french basis, so I doubt they didn't plan for that (otherwise they're complete morons, which I don't think they are).