USD "for cross-border transfers only"?

Hi, I live in Europe, but in the next couple of years I need a US account that can take USD. I need to deal with some things with state and counties in the US.

Now, my USD account in Revolut says "For cross-border transfers only". What does this mean?

Can my Revolut USD account be used like a normal american bank account number?

If not - what are my alternatives?