Hey @Fiona. Welcome to the Typeform Community! 
We understand how important it is to know that your data is safe and secure. :) Here is a list explaining what we do with all the data and why we do it:
*Investigating things to prevent fraud, spam, phishing, and other no-no activities
*Sending you emails or other comms
*Using your browsing behavior on our sites (see cookie policy) for profiling purposes. This lets us send you better ads or personalized content.
*Signing you in from third-parties (social media platforms etc.)
*Complementing data we have from third parties (requires individual opt-ins), to send you better ads or personalized content
*Dissociating you (the person) from you (the profile), to analyze user trends and get better at what we do
And Section 3 of the Legal jargon version has all the details about this topic. You can check it here.
Let us know if you have further questions! =)