These numbers can't be correct as there is no mention of iMessage who's the biggest chat app in the usa.
"4. iMessage
Communication apps like WhatsApp are available on practically all devices, whereas native apps like Apple’s iMessage (and now Apple Business Chat) are limited to one provider.
However, the user base for iPhone is constantly growing in the USA. A lot of adolescents prefer iMessage to apps like Snapchat in order to reach out to their friends.
Since iMessage is a pre-installed service of Apple, there are no official messaging usage statistics as they keep those “in-house”. Looking at the ever-growing demand and distribution of iOS devices though, we can assume that the pool of iMessage users is growing. In the fiscal year of 2017, Apple reached a quantity of 216.76 million iPhones."