I make between $500 and $2000 per month with UXWizz[0], a self-hosted analytics platform that I have been working on for around 9 years.

Hopefully I can grow it more this year as all the Google Analytics related news should make more people consider self-hosting their analytics. I stopped providing any cloud-hosted version and focus purely on self-hosting.

[0]: https://www.uxwizz.com