100,000 activists who haven't been caught yet switch to Tor for anonymity.
For $60,000, the regime monitors Tor for a year, identifies 6,500 activists, and marches them off to the camps.
And by discrediting Tor the regime pushes the other 93,500 activists even farther underground, constraining their ability to recruit, limiting their ability to coordinate with each other, and reducing what they can publish about what's happening to their country.
To what audience? It isn't quite what you're getting at in your post but this is worth saying: graffiti, zines, contact with journalists, radio operations like pirate radio, all of it is much more established and less uncertain in risk profile than being online. Crucially it may also be more effective.
Let’s say to do that, and now you have found 10k people accessing pirate bay in countries where it is blocked.
Also you captured someone who lives in Siberia and watches illegal porn, now what?
Many of these will not be actionable, like not criminals you would have interest in.