Lack of knowledge was the big problem before the internet. Late 80s, early 90s.

Take Phreaking.

Dialup BBSs (1200/75, 2400 or 9600 baud) were the primary source of dodgy files that I knew of. Some would have a secret area with various texts about hacking and quasi-illegal behaviour, including pornography of all flavours and of course the anarchists’ handbook. There were a few hacking and phreaking related stuff (getting free phone calls was huge then, given the cost of online activities - blackboxing, blueboxing, etc) and often required researching the types of PBX being used until you knew more than the people employed to run the things. To get access to this you’d need to suck up to the BBS owner, or prove your worth and “I’m not a law enforcement officer, honest” credits. Vouchsafing friends and others was another way, and there was cross-checking of you by sysops talking to each other.

The security on phone systems was laughable by modern standards, but at the time it was something very strongly guarded and if you found something, you made sure it stayed private. The phone companies helped by constantly denying anything was happening, but stakes were high. Legal consequences were high, but so were the rewards if you could get free calls.

Myself, I never did, but I always wanted to. Not having my monthly phone bills of hundreds of pounds would have been really nice…

When ADSL and always-on connections became available, phreaking stopped overnight.