1 John 2:18 uses it both as a proper noun and as a generic noun, and nowadays "Antichrist" is more a colloquial name for the first beast of Revelation 13 even if that's not directly what the text clearly calls him.
Regardless, I agree Trump is very anti-Christ. Hard to read 1 John 4 and not see almost the opposite of him.
It's not even capitalism but just society in general. Good people typically look at what it takes to lead and want nothing for it. To strive to be in charge of things you have to have a certain arrogance and to succeed you have to be ruthless enough as well.