As I understand it, if you download and play the free PS+ games, and then let your subscription slip for a while, upon recommencing it all those games would become active again, as the PSN uses both your user ID, and your PS3/4's motherboard ID to identify you......also how they can choose to brick your console if you become a PITA and have multiple infractions reported by other PSN users.

Even if that's not the case, all the games would be in your download history, so you could get them back that way, but TBH, I doubt I would bother for a lot of them, as once finished I'm very unlikely to replay a RPG or Action game.

With subscriptions falling, if only momentarily , it makes you wonder if Wipeout on Steam might have more online activity......hard one to call since apart from XL/2097 it's been solely a PSN game.
I kind of think it wouldn't for the same 'Too Hard' factor for the newbie.