Typeform provides API for customers to implement RTBF for their respondents. For example, you can delete all responses from your account that contain respondent email.
However, deletion process can take some time, especially for accounts with a lot of workspaces and forms with big number of responses, so it will require requesting several endpoints to ensure responses were successfully deleted:
Delete responses and receive list of job IDs
For each job ID check its status and ensure its status is equal to "Done"
It is important to check job status unless it will be equal to "Done", because only status "Done" guarantees that responses were successfully deleted.