Facebook can get much more than £1/year ARPU from Whatsapp being privacy-invasive, so charging a price like that isn't competitive. We don't have good numbers f

Facebook can get much more than £1/year ARPU from Whatsapp being privacy-invasive, so charging a price like that isn't competitive. We don't have good numbers from Whatsapp alone, but Facebook earns more than 150 $/year for each US/Canada user on average; and users who are willing to pay for such services probably are worth more than average, so an adequate replacement for invasive ad targeting would be quite a large monthly fee.