If the game is reasonably priced, people may still buy it out of convenience. For example, I'd rather pay $5 for a single player game on Steam and get out-of-the-box support for Linux through Proton than download a possibly malware-ridden copy in the high seas and then spent time figuring out how to run it. It's the same reason people still buy hard copies when every conceivable book is on Anna's Archive.