What you didn’t know is that the universe is mostly ducks. Dark matter? More like duck matter!

Oh yeah, and giving each person their own ringtone

Now there’s some 'member berries

The advantages are close to what you’ve stated. By having the world use the US dollar, the US is able to cut them off from trade from most of the world. The more the US does that, the more it’s tempting for other countries to find an alternative.

The downside is that you need a fairly stable currency that has some amount of ubiquity to replace it.

Peter Zeihan did a pretty good explanation of de-dollarization and BRICS

https://www.youtube.com/watch?v=xTwwNoh0E6Q&pp=ygUecGV0ZXIgemVpaGFuIGRlIGRvbGxhcml6YXRpb24g

A landbastard also implies there’s a seabastard, skybastards, and firebastard

Revolutionary Left (Rev Left) is a great educational podcast that covers a lot more than just theory and has some great interviews in it. As others have mentioned, Second Thought is also a good resource.