We do not force drivers to join VC during the races, but we highly encourage you to do so. Before the races we usually share some information with the drivers on the grid. Also please note: we are usually pretty quiet during the race events, so you should not be distracted by any chit-chat. After the race, we usually have a nice post-event chat with the group.
The only event, where it is mandatory to join voice chat is during the THR Academy guided practice sessions, as we are jointly running drills that need to be coordinated