Is Free Trial automatically converted into paid HubbleClub Premium Plan?

Yes, the Free Trial is converted into HubbleClub Premium Plan after 14 days. If you do not wish to continue with the Premium options, you need to cancel the renewal before the free trial ends. You can find the steps for the subscription cancellation at https://support.hubbleconnected.com/knowledge-base/how-can-i-cancel-an-automatic-renewal-paid-by-applepay/ or https://support.hubbleconnected.com/knowledge-base/how-can-i-cancel-an-automatic-renewal-paid-by-googlepay/