"Nation-states have a higher chance of successfully de-anonymizing users due to their resources."

"Tor’s privacy features become stronger if its nodes are decentralized around the world."

"If the Tor network had an even number of nodes in, say. every country, then it would take a significant amount of cross-border investigative work to get timing analysis done."

El Tor is trying to fix this by incentivizing the relay operators. https://devpost.com/software/el-tor