Earlier quoted context omitted.
Pre-Facebook, WhatsApp's monetization strategy has been to charge users a nominal fee for usage ($1/year). And $1/yr with 1B users doesn't justify the price tag for Facebook. So Facebook wanted to introduce advertising. PS: I'd be happy to pay them $1/month because a significant part of my communication happens over WhatsApp. The challenge is $1/month is probably too pricey for most of their user base.
FWIW this is from the perspective of and American consumer (I assume, from your comment below where you mention AT&T). Most WhatsApp users aren't American, and in a lot of places $1 is a more significant price tag. That aside though, some places don't have the infrastructure or trust to even allow any sort of online payment to happen: a lot of people in India don't have credit cards, and being from Mexico myself, I k…
If you think you need tens of millions of dollars annually to run a chat client at scale, no.
[1] https://help.openstreetmap.org/questions/9867/what-is-annual... (OpenStreetMap infrastructure costs less than $100k/year)