chwrgebacks from stubhub/Ticketmaster/etc are hard since they have you basically agree to not charge back and they use that against you. Had to try a chargeback one with them and also got denied because I signed a waiver. Complete nonsense
If that's all it takes to make chargebacks impossible, why doesn't every merchant add that to their 67-page terms and conditions?
They do try, it's just the way the ticket sellers do it make it a little more in their favor, especially when they can show you signed something. Bought a ticket to EDC and they made me write my signature with my mouse and then used that when I charged back after they cancelled half the event (this was many years ago now).