There is no account. Your answers and your pauses stay on your phone.
Four destinations receive anything at all: PostHog, on an EU host, gets which screens were opened and product events. Sentry, on EU ingest, gets crashes and reported errors. This site, at /w/, gets four numbers a day only if you named a witness, and holds them on Google Cloud in the United States. Apple gets the app's own ID to check for a newer version.
What never leaves: your pauses and their timings, which option you picked on any question, anything you typed, and the text of any error. Screenshots, view hierarchies and network addresses are switched off in the crash reporter on purpose.
Export and deletion are both free and both in Settings. Deleting removes the local store and both preference files, and turns off the witness link.
No lawyer has read this. A lawful basis under UK or EU data protection law has not been established and no data protection impact assessment has been carried out. This page describes what the app does, checked against its code; it is not a legal review.