If you opt for our Instagram photo contest with hashtag and entry form you can ask the users to accept the terms & conditions. The Hashtag + Entry Form app allows the contestants to sign up in the contest through a registration form and select the image they wish to enter in the contest from their Instagram profile. You can add the terms and conditions to the registration form and a checkbox for the users to accept them explicitly. This way, your contest will be completely aligned with the good practices of the GDPR.