Most users are concerned about their privacy, knowing that some of their details are being used to target them. As the context for Bubbl is location, by default, it does not gather or record information about any individual user.
Relevant information is sent to the phones based on their generic location, with the exact processing calculated on the phone itself. Minimal information is sent to the servers to maintain user privacy.
When it comes to GDPR compliancy, brands and campaign managers can be confident that they are not invading anyone's privacy, whilst still providing relevant 'in-the-moment' marketing communication.