Usages of у кого
Платформа сама присылает уведомления о фильме недели всем, у кого активна подписка.
The platform itself sends notifications about the film of the week to everyone whose subscription is active.
У кого есть билет на концерт?
Who has a ticket to the concert?
Elon.io is an online learning platform
We have an entire course teaching Russian grammar and vocabulary.