Did you even read what I actually wrote? I didn't say there was little piracy in the 80s, just that for the pc it was comparatible less than other platforms that were more widespread at the time.
Which brings me to something else:
That is just not true.
That depends a lot on your point of reference. In the 80s the pc was use far less as a gaming machine next to many other personal computers out there at the time. Does 1000 pirated games constitues "much piracy"? Does 10.000? In that case, then sure, there was piracy on the pc. Perhaps even a lot depending on where you put down the number for what constitues "much piracy". However, it was far more widespread on other personal computers because the pc was not the most viable gaming platform for most people at the time.
Gaming piracy was only less on PC than other platforms because the PC was a smaller gaming platform that the C64 or the Spectrum. In relative terms, piracy was just as big on PC as it was on other platforms. In fact, not only was piracy a pretty large slice of the market, it was practically institutionalized. My first bought PC came with a bunch of pirated games installed; all of my school's PCs had pirated games installed by the teachers; shops sold pirated games for all platforms. The first PC game I bought that wasn't pirated, was in 1992.
If I had to guess, I'd say piracy was a much bigger problem for the industry in the 80s than today.