Serverless solutions are typically priced based on usage - in case of db you may be charged based on actual iops, storage used etc. as opposed to pre-provisioned reserved capacity and infrastructure.
Depending on usage patterns the former can be cheaper for apps that don't need reserved capacity and need sporadic/occasional resource access or have unpredictable spikes with otherwise low usage.
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Serverless solutions are typically priced based on usage - in case of db you may be charged based on actual iops, storage used etc. as opposed to pre-provisioned reserved capacity and infrastructure.
Depending on usage patterns the former can be cheaper for apps that don't need reserved capacity and need sporadic/occasional resource access or have unpredictable spikes with otherwise low usage.