It’s wild to me, here in the EU only companies that you have some business with (or you have given them the permission in other ways) can message you.

So apart from scams, no company, for-profit or otherwise, will message you, unless you have business with them.

I sometimes watch videos by one US expat who lives in my country and this was one of the “reverse cultural shocks” (aka stuff that surprised her when she visited the US after living here for a few years) she mentioned and it was the first time I learned something like this happens in the US.