The Supreme Court ruling is a significant legal victory for Apple, as it allows the company to maintain its anti-steering rules. These rules prevent app developers from directing consumers to alternate payment methods, which could potentially reduce Apple's App Store revenue. The ruling also reduces the chances of Apple being forced to make changes to its App Store policy or reduce its rates in the future. This news is highly relevant to Apple and is likely to have a positive impact on the company's stock in the short term.