YouTube don't directly determine how much ad revenue a creator receives. Advertisers bid to place their ads next to content based on keywords and viewer demographics; the creators receive a 55% share of whatever the advertiser paid.
American viewers are generally the most lucrative, in part because of the share of YouTube Red revenues that creators are eligible to receive. A great deal depends on other contextual and demographic factors. YouTube do indirectly influence the revenue that creators receive by tagging certain videos as "not suitable for most advertisers". This is a substantial bone of contention in the YouTube creator community.
American viewers are generally the most lucrative, in part because of the share of YouTube Red revenues that creators are eligible to receive. A great deal depends on other contextual and demographic factors. YouTube do indirectly influence the revenue that creators receive by tagging certain videos as "not suitable for most advertisers". This is a substantial bone of contention in the YouTube creator community.