I just had a look at their offer and it has a few issues.

• Customers can’t resell a game license until 90 days after its release day and 7 days after their purchase (whichever is later).
• The option to list a license for sale may be revoked if the publisher delists the title
• The resale price is 100% of the current store price for the title but the reseller recieves only a 25% “resale commission”.
• This commission can be paid as store currency “IRON” or credited to your original payment method for a fee. If you original payment method has expired then only IRON is available.

help.robotcache.com/…/360029179691-Resale-Policy

So they keep 75% of resale revenue, the purchaser doesn’t see any discounts, and it can’t be used to access delisted games?

Its a bit of a monkey paw.