I found a bug in D1 where you can get PS+ privileges without actually paying for it. This bug only works in Destiny 1 (not tested it in D2 and other games) and it works only for the game instance that you do it in (restart game, you have to do it again). I would share the details here on how to repeat it and such but i would much rather report this directly where others can't see the details (assuming Bungie takes stuff like this very serious). I checked on my PSN Profile purchase history and on my PayPal and there is no payment listed. (this doesn't involve game sharing and setting other user's accounts as your main on the console btw)