"TOR was developed by the United States Naval Research Laboratory and funded by DARPA to help U.S. intelligence and foreign freedom fighters communicate under oppressive regimes. I run this exit node to support their patriotic work to protect freedom abroad. I have no control of the traffic that emerges, and I don't collect logs in order to protect covert intelligence operations."

what's stopping someone running an exit node through a "no logs" VPN? (serious question)

Nothing.