Perplexity
Perplexity says AI data retention is enabled by default for Free, Pro, and Max users, and that users can turn it off in account settings.
Consumer data can be used for AI training unless the user disables AI data retention. Enterprise data is stated not to be used for AI training.
Turn off the AI data retention setting in account preferences.
Perplexity distinguishes consumer and enterprise treatment publicly.
The help article says consumer opt-outs apply only prospectively and previously collected training data cannot be removed from that use; enterprise uploads have tighter stated retention controls.
The cited help article focuses on training collection and opt-outs rather than human-review language.
Foundational reference pages for teams adopting, deploying, and operating production AI with inspectable controls.