If you don't trust the labs directly, you can always use AWS Bedrock or Azure Foundry which should have a much stronger incentive to not train. They make money from asset rental, not selling models. I'd be shocked if they were training.
This isn’t me advocating for maximum paranoia. I’m just saying that the “privacy” aspect of the API pricing is just a business promise. I do personal coding on API pricing with Claude mainly because a) I’m normally using it quite sparingly b) the commercial relationship is a lot more transparent than these subsidised relationships where they “may” be training on your work but can’t really seem to answer what that means.
That's a pinky swear. Especially as data gets harder to come by I'm curious how long till there's a scandal on that too.