"We share data about you with our Affiliates and they share data about you with us, for the reasons laid out below: To make all Match Group platforms safer... To assist each other, as service providers, in data processing operations, such as data hosting and maintenance, customer care, marketing and targeted advertising, analytics, machine learning development and implementation... to better understand how people use Match Group services overall, to personalize your experience across Match Group services and to enhance marketing and advertising campaigns."
Hinge shares user data across all Match Group properties (Tinder, Match.com, OkCupid, etc.) to build cross-platform profiles, personalize experiences, and target advertising across their family of dating services.