> Supposedly about a billion people paid for that at the time.
(I worked for WhatsApp from 2011-2019)
From that article, user count was about 900 Million when the fee was ended; user count was about 450 M in Feb 2014 when the acquisition was announced [1]. Either way, it is a mistake to think everyone was paying.
A) Some people still had lifetime accounts from when the app was $1 for iPhone, or from the typical late December limited time free for iPhone promotions. Windows Phone got marked as lifetime for a while due to a bug/oversight that took a while to get noticed.
B) Enforcement was limited. A lot of users wouldn't have had a payment method that WhatsApp could accept; demanding payment when there's no way to pay isn't good for anybody. For a long time, we didn't even implement payment enforcement; we'd go through and extend subscriptions for a year, initially by manual script, then through automation. When we did build payment enforcement, I think we only set it on for Spain and maybe the US. Everywhere else would get the reminders that the account was going to expire, and then on the day of, it would silently extend the account and not bug you again for a while. Even where payment enforcement was on, it would only lock you out for I think a week, then your account would be extended and maybe you'd pay next time.
Adding on, for a lot of users, the hassle of paying $1 is a bigger deal than the actual $1; but so for people in lower income countries, it's both --- a) it's hard to pay $1 to a US country for a large number of people, b) there are countries with significant number of people living on a dollar a day; I don't think it's reasonable to ask them to forgo a days worth of living to pay for a messenger.
I don't remember numbers, and there's not a lot of financial reporting, because WhatsApp numbers are so small compared to the rest of FB/Meta, but there's a first half 2014 report [2] that shows revenue of $15M. Assuming payments are even over the year (probably not a good assumption, but we don't have good numbers), that'd be maybe 30 Million paying users (some users bought multiple years though), or less than 10%.
[1] https://www.bbc.com/news/business-26266689
[2] https://www.sec.gov/Archives/edgar/data/1326801/000132680114...