I've been pondering the idea of super-minimalistic (but still HA-enabled) Fediverse engine that only supports text data of fixed size (customizable by the admin), and all the features like polls and interactions but no media like images or videos or emojis or whatever else, written in something like Go.
Something you can stick on a RPI3 with 32 gigs of SD card and it will last you for a decade. Or you can install it on a couple of servers at your workplace and it will run stealthily basically forever.
The point would be, - first - because limitations are fun, and second - to promote self-hosting. If you can't afford to host anything else, you can at least host this.