Tor is part of the problem. It pretends to be an anti-censorship/privacy tool, which is kind of true but mostly in the sense that it let's you surf the clear-web, which is a design flaw that three-letter agencies explout all the time. Hidden services are a second class citizen that has a high enough barrier of entry that only pirates and pedophiles remember they are even a thing most of the time. If it really believed in its mission, it would radically redesign itself.

That aside, there really isn't anything stopping apps from building in Tor, or ideally I2P, to lower the barrier of entry to a truly anonymous network. The end user shouldn't even have to know about it. But the profit motive is to not even bother because it might make apps slower and 99 percent of users don't care.