I’ve used Typeform’s webhook feature a number of times to good effect, whereby you receive one POST request to whatever endpoint you specify upon each form submission. This may have changed, but when I last used it that was the only way of getting your data out of their system, which was admittedly frustrating. A lot better than nothing though.

Used it for all kinds of things: quizzes hooked up to a loyalty program, to award the user points for all correct answers; satisfaction surveys after ordering a product; writing and photography competitions (again hooked up to the loyalty program); an in-depth annual user survey; etc.