Copies of GTA 6 won't work online, which is what the vast majority of people are likely going to be buying it for. Lack of copyright also doesn't mean lack of sales. GTA 5 was a huge commercial success despite being cracked in days.

I pay for Tidal and buy 99% of my games despite having access to safe private trackers. On the other hand I pirate 100% of my TV and movies. Make of that what you will but for me it's always a service issue (or lack thereof).