This is awesome. Is it necessary that the PC remain fully online throughout the day? I wouldn't mind putting my PC out there but sometimes when I get back from work my modem or router has crapped out and I need to restart things (not the PC), and I've been told it's a few thousand (over 3, actually) to wire up the house with Ethernet so I live with the status quo for now
You can list your computer for as long as you like! It's up to the ML/AI researchers to decide which machines they want to use based on the specs they see, and for how long.