What is the sentiment of this news? Please choose an answer from {strong negative/moderately negative/mildly negative/neutral/mildly positive/moderately positive/strong positive}.
Text: Elon Musk's declaration of war on Apple in a series of tweets on Monday gives Spotify and Fortnite maker Epic Games a powerful ally in taking the tech giant to task over its 30% App Store fees.
user
strong negative
assistant