Bootlegging is what we called it as kids

It was also called piracy back then too. It was incredibly common on the Commodore 64 starting in the 80s . They'd often call themselves crackers, because you needed to crack the piracy protection to be able to copy disks.

Those disks and even cassettes would then be shared from person to person or sold in shops or on second hand markets. AFAIK this is also when 1337/leet became popularised, to avoid censorship on BBSes, where file sharing was also possible.

For example, a magazine from 1991:

Note the group is called Elite productions and they call themselves pirates. There's also mention of crackers, specific events, and I especially enjoy that a piracy/cracking group felt it necessary to add a copyright logo next to the name of their piracy group which was called Elite Productions.