For accessing nearly 9 in 10 classic games, there are few options: seek out and maintain vintage collectible games and hardware, travel across the country to visit a library, or… piracy.
This last part especially is interesting. Because in this particular case, piracy seems like a totally positive thing. Frankly, I don't have a bad feeling downloading really old classics.
Of course, there is always the problem of malware so ideally, there would be an official source to get these games from for free.