Read this document unless you want your code to be used as training dataset

Google case

Three options for gemini-cli

Sign in with Google
Gemini API key
Vertex AI

gemini-cli/tos-privacy

Login	Variant	ToS	Privacy
Google Account	-	Gemini Code Assist	Gemini Code Assist
Gemini API	unpaid	Gemini API - unpaid	Google privacy policy
Gemini API	paid	Gemini API - paid	Google privacy policy
Vertex API	-	GCP	GCP

In short:

Vertex API for best privacy
Paid ⇒ consumer-level privacy
Unpaid ⇒ use my code to train Gemini

Anthropic / CC case

data-usage#data-retention

Zero data retention (ZDR) option for enterprise
30-day retention
- Commercial user by default
- Consumer user if opt-out here
5-year retention
- Consumer user if opt-in here
- Use my code to train Claude