Snowflake stores data in S3 in Snowflake's various AWS accounts. Egress fees are necessary when performing anything outside of Snowflake.
Databricks operates on data stored in your S3 on your AWS account(s). Databricks also runs on your compute contained within your AWS account(s).
Both approaches have valid use cases.
Egress fees are only if you are unloading into a different region/cloud. If your data is in SF AWS us-east-1, and you unload to your S3 in us-east-1, there is no egress fee.
> Snowflake charges a per-byte fee for data egress when users transfer data from a Snowflake account into a different region on the same cloud platform or into a completely different cloud platform. Data transfers within the same region are free.
https://docs.snowflake.com/en/user-guide/cost-understanding-...