The use case for TOR is illegal activity. Some illegal activity is not immoral, like organising a protest against a dictatorship. But Tor is not a useful tool for simply browsing websites. The inconvenience isn’t worth it when a regular browser fulfills your needs better.
It’s like money laundering. It could be done recreationally, but that’s not the normal use case.
Tor isn’t explicitly developed to promote illegal activity. I’ts just another browser with some more layers, just like an Onion.