> There are third-party companies like Mixpanel and Amplitude that you can send your users' data to, but they will only process it for you, and not for anyone else.

These tools are increasingly developing new features that allow them to act more like a "CDP", essentially allowing you to send data from the tool to something else.

Want to send data from Amplitude to Facebook? That's easy https://amplitude.com/blog/amplitude-customer-data-platform