Let me know if you have specific issues in mind. People have a lot of different privacy concerns so I can list a couple below:

On-device vs. off device is an unavoidable tradeoff. Sapling, very early on, decided to build the best possible AI writing assistant. With current technology and compute limits, it meant hosting the brains in the cloud. Similar objections have been raised about cloud-based AI voice assistants (Google, Siri, Alexa), but I think for a lot of consumers the most important thing is product experience.

We sell software, not user data. We have strict cyber security policies such as server hosting in a VPC, encryption for all data at rest and in motion, and MFA access. Enterprise customers have access to options such as on-premise solutions, automatic PII removal and no data at rest options (losing benefits of a system that improves over time).