Tor is designed to benefit from an arms race by spy agencies.
If your spy agency controls the vast majority of the Tor nodes, you can see what everybody is doing with Tor, and nobody else can. Whereas if somebody else's spy agency controls the vast majority of the Tor nodes, they get that power.
When you're both working hard to get more Tor nodes, the Tor network is made better for everybody and unless you achieve that vast majority control you get no benefit for your effort, still, never give up.
Suppose the Russians have 100 Tor nodes, the Americans have 100 Tor nodes, the Chinese have 100 Tor nodes and random good Samaritans run 100 more. Nobody can snoop on Tor, it works really well with 400 nodes. The Americans buy 200 more nodes. The Russians don't like that and nor do the Chinese! They each buy 200 more nodes too. Now there are 1000 Tor nodes, it works even better, and nothing changed for user security.
If your spy agency controls the vast majority of the Tor nodes, you can see what everybody is doing with Tor, and nobody else can. Whereas if somebody else's spy agency controls the vast majority of the Tor nodes, they get that power.
When you're both working hard to get more Tor nodes, the Tor network is made better for everybody and unless you achieve that vast majority control you get no benefit for your effort, still, never give up.
Suppose the Russians have 100 Tor nodes, the Americans have 100 Tor nodes, the Chinese have 100 Tor nodes and random good Samaritans run 100 more. Nobody can snoop on Tor, it works really well with 400 nodes. The Americans buy 200 more nodes. The Russians don't like that and nor do the Chinese! They each buy 200 more nodes too. Now there are 1000 Tor nodes, it works even better, and nothing changed for user security.