Monero could be a good coin for dark net stuff, like drug dealers used to use bitcoin even though it wasn't too private and now they are using monero, hackers use monero as well when they hack into a computer. However at the end of the day there is really nothing monero offers to a regular person.
Anonymity and privacy aren't only limited to illegal activities and criminal activities. Many people have been aware about their privacy and don't want their monetary activities to be tracked (i am one of them) so they use decentralized apps and private coins.
Monero has some other good features too, and this is why largely adopted before the lunch of other competitor projects like Beam and Grin. I think all of them offer a good opportunity to long-term investement especially for Monero and Grin due to they are fully decentralised and maintained by community .