I don't think you appreciate the worldwide popularity of Game of Thrones
From Wikipedia:
Viewer numbers
The first season averaged 2.5 million viewers for its first Sunday-night screenings and a gross audience (including repeats and on-demand viewings) of 9.3 million viewers per episode. For its second season, the series had an average gross audience of 11.6 million viewers. The third season was seen by 14.2 million viewers, making
Game of Thrones the second-most-viewed HBO series (after
The Sopranos). For the fourth season, HBO said that its average gross audience of 18.4 million viewers (later adjusted to 18.6 million) had passed
The Sopranos for the record. By the sixth season the average per-episode gross viewing figure had increased to over 25 million, with nearly 40 percent of viewers watching on HBO digital platforms. In 2016, a
New York Times study of the 50 TV shows with the most
Facebook Likes found that
Game of Thrones was "much more popular in cities than in the countryside, probably the only show involving zombies that is". By season seven, average viewer numbers had increased to over 30 million per episode across all platforms.
The series set records on pay-television channels in the United Kingdom (with a 2016 average audience of more than five million on all platforms) and Australia (with a cumulative average audience of 1.2 million)