Apple has come out with new child safety policy which is meant to stop the spread of child abuse imagery, WhatsApp won’t be adopting Apple’s new child safety, according to WhatsApp’s head Will Cathcart . In a Twitter thread, he explains his belief that Apple “has built software that can scan all the private photos on your phone,” and said that Apple has taken the wrong path in trying to improve its response to child sexual abuse material, or CSAM.

Facebook Inc.’s WhatsApp messaging unit blasted Apple Inc.’s plan to monitor sexually exploitative images of children on iPhones as bad for privacy, opening a new front in the battle between two of the world’s biggest tech companies.

Apple had announced this plan, involves taking hashes of images uploaded to iCloud and comparing them to a database that contains hashes of known CSAM images. According to Apple, this allows it to keep user data encrypted while still allowing it to report users to the authorities if they’re found to be sharing child abuse imagery. Another prong of Apple’s Child Safety strategy involves optionally warning parents if their child under 13 years old sends or views photos containing sexually explicit content. 

Cathcart says that Apple’s new measure is “very concerning,” saying that it would allow governments with different ideas of what kind of images are and are not acceptable to request that Apple add non-CSAM images to the databases it’s comparing images against.

The EFF released a statement that blasted Apple’s plan, more or less calling it a “thoroughly documented, carefully thought-out, and narrowly-scoped backdoor.” The EFF’s press release goes into detail on how it believes Apple’s Child Safety measures could be abused by governments and how they decrease user privacy.

WhatsApp’s position deepens the battle between Facebook and Apple about data. Facebook Chief Executive Mark Zuckerberg has long bemoaned what he sees as too much power Apple has over the social-media giant’s business.

Apple has made the protection of user information on the iPhones and some other devices a key part of its pitch to consumers and taken shots at Facebook for its data-collection practices.