Does Coinbase tell HMRC?

I'm a bit confused about Coinbase and HMRC. Do they share information with each other? I've been hearing a lot about cryptocurrency and taxes recently, and I'm not sure if I should be worried. If Coinbase is reporting my transactions to HMRC, then what does that mean for me? Am I going to get taxed on my crypto earnings? Or is it just for the purpose of preventing tax evasion? Could you please clarify this for me? It would be really helpful.