Security of the Industry,
for Comparison:

What Sam Altman says
about OpenAI confidentiality:

“People talk about the most personal sh** ….as a therapist, a life coach; having these relationship problems and [asking] ‘what should I do?’ And right now, if you talk to a therapist or a lawyer or a doctor about those problems, there’s legal privilege for it. There’s doctor-patient confidentiality, there’s legal confidentiality, whatever. And we haven’t figured that out yet for when you talk to ChatGPT.” (Techcrunch 2025 article)

What Anthropic says about confidentiality,
according to their Labor Day 2025 announcement:

Paid users “agreed” to five years of data retention in their terms of service update.

Google: The cautionary tale of the DNA company founded by the wife of Google’s co-founder:

This is a summary of what happened to the DNA sequencing data when 23 & Me went bankrupt (BBC link).