Many companies have suspended spending on Twitter over concerns about Musk’s content moderation plans for the site.
Musk said Twitter saw a “huge” drop in revenue, blaming activists for lobbying advertisers.
In a tweet on Monday, the billionaire accused Apple of “censorship” and criticized its policies, including the fees it charges for purchases made in the App Store.
“Apple has mostly stopped advertising on Twitter. Do they hate free speech in America?” asks Musk.
Mack tweeted directly to Apple’s CEO, asking, “What’s going on here @tim_cook?”
The owner of the social media platform also said that Apple had threatened to block Twitter from its app store, but did not explain why.
Musk, who bought Twitter for $44 billion last month, is under pressure as some companies block their spending on the microblogging site.
He said he hopes to make money by turning Twitter Verification into a paid subscription service, but currently most of the site’s revenue comes from advertising.
The Washington Post reported that Apple was the largest advertiser on Twitter, spending $48 million on advertising on the social network in the first quarter of 2022. Firms including Cheerios maker General Mills and Volkswagen are among the firms that discontinued their spending on Twitter in recent weeks.
Watchdog Media Matters reported last week that half of Twitter’s top advertisers pulled their ads from Twitter over concerns about the microblogging site’s direction.
According to US technology website The Verge, Apple’s media agency Omnicom has advised the Silicon Valley giant to halt the announcement out of concern for Apple’s “brand safety”.