This is not how it works. If you make it available to EU users, you have to comply with GDPR (at least when it comes to those user's data).
For the same reason WhatsApp's new T&Cs don't really change anything for EU users.
However I don't think the collection of contacts is actually illegal under GDPR, considering WhatsApp does exactly this too. And it's huge in Europe, much bigger than in the US. if they haven't gone after WhatsApp for this, they will probably not do so for Clubhouse.
For the same reason WhatsApp's new T&Cs don't really change anything for EU users.
However I don't think the collection of contacts is actually illegal under GDPR, considering WhatsApp does exactly this too. And it's huge in Europe, much bigger than in the US. if they haven't gone after WhatsApp for this, they will probably not do so for Clubhouse.