[uberman]

Read about the arbitration rules you agreed to. Likely similar to: https://www.adobe.com/legal/terms.html

Arbitration costs money (usually split between both parties). If you feel like you have a case and are willing to put up an additional $500 to $1000 you might get your assets back.

I think the bigger thing for Adobe is that invoking arbitration might force them to engage their legal council and you might find them much more willing to give you your assets back pre-arbitration than to pay their legal team to represent them.