That's true. In the EU, it's the context of the relationship itself that determines exclusivity, I have never seen people needing to declare it explicitly.

> Whether a meeting has a romantic interest is never really expressed

That's because to most Europeans a meeting is just a meeting, a pleasant way to spend some time in conversation and maybe getting to know a person better. Romantic interest, a friendship, or an acquaintanceship, may develop from that. If it doesn't end up being romantic in nature, that doesn't usually mean the meet-up is considered a failure.

Now, I would contrast that sharply with "player" behavior (as applied to both sexes), which is virtually the same in both the US and the EU.