Under capitalism, the rich are forbidden to rob the poor. Most elites are very unhappy with such ban.
But the tariffs are an interesting experiment, with some non-economical geopolitical goals thrown in, so we'll see how it goes.
Not as it is usually defined. Many places take inspiration from free market capitalism, like Javascript takes inspiration from C, but have developed their own systems. The US model is usually referred to as mixed-market capitalism and the EU model is generally thought of as a social market economy.
Of course, that's just semantics. While there is value in using shared terminology, you can make up any definition you want on the spot. You could call the old Soviet system "free market capitalism" if you really want to. The world is your oyster.
How come nobody practices it, then? In fact, right now the world's biggest economy is doubling down on trade restrictions.