Data teams switching to Polars often hit integration gaps with proprietary or less common data sources. A library of simple, well-tested connectors (S3, MongoDB, etc.) would ease adoption.
Focus on connectors for databases/file formats Polars doesn't natively support. Charge per connector or as a bundle. Start with one connector for a painful format (like Excel with complex sheets).
The risk is Polars' ecosystem developing native support for these formats over time.