The WP does specifically mention North America:

To estimate profits on the platform we will take the three largest markets -
Asia, North American and Western Europe. On average the marketing cost
to acquire a gamer is $1.50. The average revenue spent on the platform
month per gamer is $3.71.

And an image in the WP says the cost of acquisition in the US is 1.46 which is unfounded and not true.

Most people will not see a comment if made on Slack, that is why I chose to write here.