Nov 28 (Reuters) - Elon Musk accused Apple Inc (AAPL.O) of threatening to block Twitter Inc from its app store without saying why in a series of tweets on Monday that also said the iPhone maker had stopped advertising on the social media platform.

The billionaire CEO of Twitter and Tesla said Apple was pressuring Twitter over content moderation demands.

conservatives, was restored by Apple in 2021 after the app updated its content and moderation practices, the companies said at the time.

Do they hate free speech in America?," Musk, who took Twitter private for $44 billion last month, said in a tweet.

22, the week before Musk closed the Twitter deal, according to ad measurement firm Pathmatics.

In the first quarter of 2022, Apple was the top advertiser on Twitter, spending $48 million and accounting for more than 4% of total revenue for the period, the Washington Post reported, citing an internal Twitter document.

Companies from General Mills Inc (GIS.N) to luxury automaker Audi of America have stopped or paused advertising on Twitter since the acquisition, and Musk said earlier this month that the company had seen a "massive" drop in revenue.

Ben Bajarin, the head of consumer technologies at research firm Creative Strategies, said that Musk may be reading too much into a regular process Apple goes through in app review.