For my two open-source projects, Fugu [0] (privacy-first product analytics) and Mapzy [1] (store finder), everyone can self-host for free without any feature restrictions (AGPLv3 license). We then offer a hosted version that people can use who don't care about self-hosting at a price that makes self-hosting not worth it for most users. Of course, there are other reasons to self-host outside of cost.