I try to buy PlayStation titles on disk as much as possible because I learned this lesson early on. A while back someone took control of my PlayStation Network account and deauthorized my PS3. I reached out to Sony and they said I'd have to wait the standard 6 month period until I could deauthorize the squatter's devices. During that time I lost access to any game I didn't have physically on disk. It showed me how ephemeral digital "ownership" is. I still pay for digital copies of games from time to time but much of my PS2-4 library is physical.