At my previous company we used Stripe, and never saw any value in their data products. I was always curious as to why they had data products and would be interested to hear the other side – satisfied users with solved use-cases. The reason it always seemed weird to me is that billing data is just one small portion of a company's data. We had all sorts of data about our users – preferences, demographics, data from mar…
Some businesses are large enough that polling the API and/or ingesting webhooks is a poor architectural choice or simply impossible — Sigma and the other bulk data products are extremely useful for these businesses. The other kind of business that benefits from Sigma is much lower tech than yours, and most likely doesnt have a database or something that can accept webhooks.
Lower tech businesses perhaps, but most of them probably aren't doing data analysis anyway.