As this article states, the biggest challenge in a breach like this is the fact that so many users reuse the same usernames and passwords across a large portion of their online accounts.  If you are a user of this service, you have already been forced to change your password.  Take this breach as a warning to not replicate the same credentials all over the internet.  Use a password manager.  Use unique passwords.

https://www.tripwire.com/state-of-security/featured/zomato-hacked-database-of-17-million-users-stolen/