It is so important, that many countries make it illegal to hide international football matches behind paywalls, specifically.
It is so important, that there are articles written about its importance on EU institutes websites. For example, this one reflects on Footballs importance in relation to the First, Second and Cold wars. https://www.iss.europa.eu/publications/alerts/european-footb...
To see Trump so flagrantly manipulate it sends a cultural signal that is hard for those outside of Europe to see, and that by some can be seen as the cultural equivalent of the political threats Trump has made against NATO.
At this point, your average European Trump supporter/right wing populist needs only reminding of Trumps interference to get a complete positional change - that's how bad it is.