On PapersWithCode, different datasets have benchmarks: https://paperswithcode.com/datasets

You can also break down by task here: https://paperswithcode.com/sota

For churn, you might go to time series forecasting first: https://paperswithcode.com/task/time-series-forecasting

They have this subtask which is a bit different because it's about novel products rather that continued sales, for example:

https://paperswithcode.com/task/new-product-sales-forecastin...

But you get the idea of how they organise by task. I'm curious about other benchmarks and interfaces too and would like to see others.

I think HuggingFace and Kaggle have some overlap with different tasks that have benchmarks.