Just the simple fact that Tor was started with a bunch of US intelligence money is cause for concern.
Keep in mine not everyone uses TOR to evade the three letter agencies. I’m a TOR relay operator and the main reason I’m running it is to give people in oppressive regimes a better chance at exchanging free information. To these people getting spied on by western intelligence agencies is probably the lesser evil compared to their own tinpot dictatorship governments.