In this very early beta version, yes. However, we have plans to allow hosting of participant data on services such as Google Drive. Additionally, we plan to offer researchers the paid option to host specific experiments on their own servers if they wish. This means we would never have access to this data at any point in the process. If this is a feature you’re eager to see, please let us know. We rely on feedback from users to decide which features to prioritize, so this really makes a difference.