Failure to disclose voids the agreement, which leads to refunds and serious payments for damages. No deductions are permitted except for refunds of unused music due to technical faults. Valve then refunds the fee should the game exceed $1,000 in sales. The three-year lookback period coincides with the statute of limitations for tax refunds. They may also reduce administrative work or otherwise be essential in arranging fuel taxation refunds. Most stores require proof of purchase and impose time limits on exchanges or refunds. In other cases, vendors have asked that customers requesting refunds sign non-disclosure agreements. Heavy criticism followed, with reports of some paying Spotify subscribers demanding refunds or unsubscribing. In October 2018 a flood of requests for ofo user deposit refunds started. Many fans walked out, and costly ticket refunds were issued. However, Nintendo has a policy for digital pre-orders that does not allow such refunds. Nvidia claimed that it would assist customers who wanted refunds in obtaining them. Mongeau later apologized and said that refunds would be issued. The lawsuit alleged that Sleepy's misled consumers regarding their exchange policy, customer refunds, and advertisements. Gurth does so, but Rebecca secretly refunds the money.