It really isn’t a criminal enterprise mate, it’s a more secure way to access the internet, although you can indeed source various types of criminality on the dark web
Imo, everyone should be using Tor, a dark web browser, along with a vpn for browsing the normal internet as it’s far more secure than the likes of Google
My understanding is that everything you do in Tor is essentially encrypted, so it gives you an added layer of security (hence why it’s popular with the criminal underworld)
That’s my basic understanding of it anyway & if I’m correct, I’ve got no idea why this isn’t advertised as a secure way to access the internet (possibly because data is king & Tor would put a stop to data collection??)
Ps I don’t use it myself as I cba trying to figure it out, but have mates who do