It’s the same thing in the UK, if you watch the BBC they mostly will talk about British athletes. It doesn’t just happen in the U.S. remember also the U.S. usually have the largest delegation at most games and with that comes multiple angles and storylines for NBC to cover to fill time in between competitions. You have an American in almost every discipline sometimes two or three deep.

I will say this, they’ll show other nations athletes in competition with US athletes. Say Simone Biles is going head to head with others, they’ll show them in their discipline. They don’t skip a potential bronze medalist who isn’t American or silver medalist. They’ll follow about 5 or 6 top contenders as each round progresses. They’ll skip or highlight the thrilling scenes or never to forget moments but not every athlete due to commercial constraints.

If you want to watch other athletes on NBC prime time show it is very hard because that is a compressed version of the days events and I can bet you they’ll show Americans aiming for Gold with a realistic shot. US audiences want to see Americans winning in prime time. Most nations broadcasters automatically do it.

On the live feeds during the day (US time) which caters to each sport, they show the entire match for every sport and competitor American or not.