Why the focus on warez? There was a lot of ASCII/ANSI art making that had nothing to do with illegally ripping off copywritten software. For example, any BBS sysop would've had an opportunity to show off their custom ANSI art as part of the BBS itself.
There was a brief period after the precipitous crash of BBS popularity where exposure to ANSI art was mostly through warez intros and crackscene tools.
Anyone who was a teen in the 90s is more likely to reminisce about the warez scene than the BBS scene, which was popular when they were rather young kids.
I think it has more to do with the type of audiences. I was lucky enough to have access to my dad's Atari 8-bit computer, as well as a 286, both that allowed me to connect to BBS systems. I was exposed to the ASCII/ANSI art early on. Most of my friends did not have PCs until the late 90's or early 2000's. Their experience with the art was through .NFO files in warez. I imagine how old you are, and when your first experience with computing, dictates your connection to the art scene.