In his 21 tweet thread on Wednesday, Spotify CEO Daniel Ek renewed his attack on Apple in a series of tweets alleging the iPhone maker gives itself every advantage while at the same time hurting consumers. Ek tagged a number of sympathetic business leaders, including Musk, Microsoft President Brad Smith and Proton founder Andy Yen.
On Monday, Elon Musk, the world's richest person, criticized the fee Apple charges software developers for in-app purchases, and posted a meme saying he was willing to go to war rather than pay it.
Spotify has received antitrust complaints against Apple in different countries, alleging that the 30% charge has forced Spotify to artificially inflate its own prices.
Apple did not respond to a request for comment on Wednesday. The 30% cut it takes on purchases made in its App Store is used to protect consumers in areas such as fraud and privacy.
Tim Sweeney, CEO of Fortnite maker Epic Games, said on Wednesday that fighting Apple's monopoly was an American issue transcending party politics. How much longer will we look away from this threat to the future of the internet? How many more consumers will be denied choice? There's been a lot of talk. Ek wrote that talk is helpful but we need action.
Musk is expected to talk to European Commissioner Thierry Breton via videocall on Wednesday afternoon, though the agenda was not known. The couple had previously met in Texas in May ahead of Musk's $44 billion purchase of Twitter, where they signaled broad agreement on EU tech regulation policy.