A lot of people do actually. Lots of open source projects mention a dedicated matrix room/space on their project page for example. Regarding discovery: Can we presume you have used the ‘Explore rooms’ functionality of your matrix client? (Element has this).
https://archive.is/20250312183235/https://www.404media.co/saudi-arabia-buys-pokemon-go-and-probably-all-of-your-location-data/