Because the same big companies (Microsoft, Google, and Facebook) that are offering LLM products today have been shown time and time again to lie about data rete

Because the same big companies (Microsoft, Google, and Facebook) that are offering LLM products today have been shown time and time again to lie about data retention/use/privacy and prefer to just eat fines over complying. That and the ingestion of data into the training data of these systems is crucial to their functioning so there is a reason why these companies are very likely lying with their data processing agreements. Adobe still claims that their Firefly product is only trained on publicly licensed stock photo data and yet it has been repeatedly found outputting watermarks from artists that are not supposed to be in that training data.