There is a cost to manage the instance, upgrading monitoring etc. Even though there is no SLA on the basic tier, I would imagine Azure does some maintenance and

There is a cost to manage the instance, upgrading monitoring etc. Even though there is no SLA on the basic tier, I would imagine Azure does some maintenance and monitoring. However is it worth 35$ etc, I am not sure. Also, the basic tier does not have replicas. If you want replicas you have to pay 100$ per month.