"< sech1> and xmrig donation server is also xmrig-proxy" Do you know whether it's connected to daemon or pool with stratum?

it's connected to daemon (one for Monero, one for Loki)

Accorditg to my knowledge it's impossible due to problem in xmrig-proxy with daemon support, i'm going to recheck

xmrig-proxy was _created_ to handle donations

although I'm not sure what's on the other end

It was being used for donations before daemon support has been added. It must be connected to something different from daemon.