Keep it - Costs you less than $20 a year, might give you good (or cautionary) memories, and one day someone might want to buy it off you for real money.
DarrenDev
Keep it just for the email addresses and accounts you may have opened using those email addresses. If you don't, there'll be something you've missed and you won't find out for 6 months. But drop the website.
I have a number of zombie domains that I keep just for that reason.
KomoD
If you have any accounts on the domain, then yeah probably keep. That's what I'd do at least.
brudgers
Zombie businesses don’t make bootie calls. Let it go and move on. Good luck.