It will be interesting to see if privacy coins actually gets widespread use, I think that regulatory bodies will start to crack down hard if that ever happens.
Monero have been added to most darknet markets already.
There is still a need for customers to obscure the IP of converting non-private coins to private coins because private coins gets delisted from fiat on ramps.
For converting non-private to private coins, there's Bisq (which runs under Tor BTW)
Ideally it would be possible to buy monero directly and withdraw it, never converting it, just buy and spend. But practically more likely to withdraw some non-privacy coin and convert.
There's also localmonero.co
