It's not impossible for other countries to affect US internet companies. The EU GDPR is probably the best example. Once that went into effect, every website began showing popups enabling users to control cookie settings for that website, even within the US to US citizens not subject to GDPR. If there's a country or block of countries with large enough population relative to US, and where US companies operate, it can have some influence on US.

That said, yes if you use FB/etc you should assume your data could be used by US intel agencies for similar purposes. Just don't use those apps. Heck, I'm American and refuse to Facebook or any of their other services (Insta, Whatsapp, Meta). None of this stuff is actually necessary to live a happy healthy life, and often even detracts from it.