WhatsApp CEO Jan Koum, reportedly unhappy with parent company Facebook, has decided to leave.

Koum announced his departure on Monday; he said it was time for him to move on, and made no mention of any tension with Facebook. But according to the Washington Post, Koum has been clashing with Facebook over data privacy issues, including whether to weaken WhatsApp's end-to-end encryption, which it rolled out in 2016.

Facebook bought the mobile messaging service in 2014 for $16 billion, and at the time Koum said the deal would change "nothing" for WhatsApp users. However, the leaders from both companies have reportedly clashed over how Facebook could make money from its acquisition. Koum resisted his parent company's attempts to pull more data from WhatsApp users for advertising purposes. But in 2016, Facebook began collecting phone numbers from WhatsApp users so it could offer better friend suggestions and show more relevant ads.

To attract more advertisers to WhatsApp, there were also discussions about weakening the platform's end-to-end encryption, which essentially prevents anyone, including Facebook or WhatsApp, from reading the contents of messages sent over the service.

The Post, citing anonymous sources, said Koum had been "worn down by the differences in approach," but that his decision to leave came before the Cambridge Analytica scandal hit Facebook in March. The report went on to claim that other WhatsApp employees are also "demoralized" and plan to leave in November, when they can exercise all their stock options.

Despite the Post's reporting, Koum portrayed his departure in positive terms. "I'm leaving at a time when people are using WhatsApp in more ways than I could have imagined. The team is stronger than ever and it'll continue to do amazing things," he wrote in a Facebook post.

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