Typeform form data breached

From their email:

What happened?

We identified the breach at 14:00 CET on June 27th, and remedied the apparent cause of the breach at 14:30 CET on June 27th. We have since been performing a full forensic investigation of the incident to be certain that this cannot happen again. The risk of reoccurrence is now deemed low enough to send out this communication. The results that were accessed are from a partial backup dated May 3rd, 2018. Results collected since May 3rd 2018 are therefore safe and not compromised.