This is what I'm wondering too. We've signed a confidentiality agreement with all the big players (as I'm sure all other companies have done), which is supposed to ensure our data is both segregated and not used for training. I don't trust these companies not to do just that; their business is in taking what we have and training their models.

Yeah, I always wonder if they do some type of obfuscation and transformation on the private data and find a way to backdoor the info without technically using it directly.