The operator of this sbm Sync server sells the paid plans on it, not Google, Mozilla or Stripe. Contact: truex@equwal.com. Stripe takes the payments. This server never sees your card.
You can cancel a subscription at any time. To cancel by email, write to truex@equwal.com. A subscription that you cancel stays active to the end of the period that you paid for. Then the charges stop.
For a full refund, write to truex@equwal.com within 30 days of a charge. A pre-order gets a full refund at any time before the team plan starts.