1) We don't do anything with it other than use it to provide the best user experience we can. We won't turn it over to other organizations. Technically, the thought records could be used to identify an individual based on your voice, but someone would need to gain access to them. They are stored and transmitted encrypted.
2) Currently we retain all data. This may change in the future. For the progress to work correctly you'd want to retain a month's worth of data. The idea is that thought records help you analyze your thinking over time. This may take months, or longer. I kind of like the idea of allowing the user to set their own retention policy though. It would take a little work to implement, but I think it's reasonable.
3) Yes, if you close your account we will destroy everything (except for what we need to retain for purchasing records, but that is anonymized when we delete an account). You can't currently request that through the app though, you have to email us at info@thinkpacifica.com.
4) We actually have implemented a lot of offline functionality. We just couldn't get it to where we wanted to before launching. As a bootstrapped company, we need to try to ensure our longevity in order to provide this. But yes, it's definitely on the roadmap.
Happy to answer anything else!