1) Y Combinator is based in the US, and HN is hosted in the US. While the non-US participants are welcome & valuable, It’s reasonable to assume a commenter is from the US unless they specify otherwise.

2) the statement is relevant regardless of your nationality. There’s only a couple big regulators for this kind of thing worldwide, so a movement by any of them is relevant regardless of whether or not you fall under their jurisdiction directly. GDPR is very meaningful to US tech folks, for example.