American football was never popular in out countries
We are not used to that. our regular cable or digital tv does not show American football matches. This is not just sport, this is sport and show, two in one. It is really sometimes exciting to watch American football compilations on YouTube, mostly injury or brutality compilation.
I find this sport interesting, but it is hard to watch it. It is hard to understand rules. Once I've found on some Russian media, that American football is in Guinness record book as a sport with most complicated rules. We are most used to two teams compete against each other, but in AF there is defence and attack teams, they switch during games, hard to count score, awful, for me.
As a person from nowhere near USA, and still played football in college, I have to disagree with you here. It is not as popular as it is in the USA of course, or for example Basketball and NBA is very popular there AND everywhere else, so it is not like that yet which is true.
However, it is getting more and more popular, people saw it, and with the introduction of social media it became a bigger deal which helped teams to be formed. There are now clubs and even European competitions for it, the local ones are not that much big of a deal but there are some 10k+ viewership for each game in my nation.
It is not even close and some streamer watching some funny youtube videos get more views, so there is a big room to grow for sure. This doesn't mean that it is non-existent, it is there and growing market and I believe that if playing it this popular, gambling on super bowl must be even bigger.