In 2019, Tesla added an eCommerce feature to their mobile app, allowing Tesla car owners to buy upgrades for their vehicles, such as an autopilot that would unlock "Full Self-Driving" capabilities for $4,000. Some customers purchased this by mistake, and were outraged when they discovered that Tesla was refusing to provide a refund. Renowned author Nassim Nicholas Taleb complained on Twitter: _"I unintentionally hit the buy button while the app was in my pocket". _
Hidden on the purchase screen was some small, low contrast text stating "upgrades cannot be refunded". This text was the lowest contrast text on the page, and was difficult to see (Image source: Reddit, 2019).