Probably
MangaDex Forums
Blocky_Mudkip
athayanezant
Depends. If I still feel, "oh this is one of the treasure from the old days", then I'll keep it. If I feel, "wtf is this? I don't need this anymore", then I'll probably delete it.
5hijima
im keeping it , probably to find out who did it i think
Mangamoz
Would probably delete it to avoid having to explain to someone why you had that in your hardrive.