who knows

The people doing them! Everyone else, none of our business. The cool thing is that you can just run mostro on a gated, unadvertised relay and no one will ever know whats up.

I'm low-prio building a tool (for myself, not spooks, so I won't publish it) that listens to published data and can get an (incomplete) idea about available services and usage. It's good to form an opinion of maturity.