I'm really hoping Mistral will succeed with their open models, so I'm a bit biased, but I don't have any affiliation. This submit is a bit of well-meaning but confused scaremongering however.
Mistral has had, and continues to have, a toggle in the admin settings that permanently disables training on your data. The option has not been removed, and previous opt-outs are still honored. As far as I know, Mistral always trained on your data by default except for the enterprise plan, with the option to disable it on all plans, and with the option for organizations to make the choice for all your users.
Kagi Ultimate still uses mostly closed models by OpenAI / Anthropic, etc.
There is no toggle in my admin settings to disable this for the whole org (when on the Team plan). If it was there before they recently removed it.
"Mistral always trained on your data by default except for the enterprise plan" - This is not true, until last week all docs stated that the use of your interactions with Vibe to train Mistral's AI models was off by default on the Team plan. Now that is only still the case on the enterprise plan.