So that'd be $33 for 6 12-packs roughly $5,50 per pack or like 250% of the price in the image?

12oz can is 355ml very close to the 33 cl or 330ml or 1/3 liter in Europe.
The price you state is almost $1 per can.
Here (Denmark) we get 1 can for $0.30 when on sale, which they almost always are now, because they've lost sales to local brands.

When I see people buy these at the cheap, I sometimes comment in a very soft overbearing voice: Nonono we aren't buying American, like gently correcting a small child.

Edit PS:
The price in Denmark includes 25% sales tax.

Yeah, for a very long time I refused to pay more than $3/12 pack. Now I consider it around $5-6.

That's almost 400% increase, I would not consider that mildly infuriating. Yikes.

No, that was price per case. If I'm not mistaken I havent see any change in can size.

I always thought the bottles of soda were priced even weirder. I remember buying a 20oz bottle for about 2 dollars, or you could buy a 1 liter bottle for about 2 dollars or you could buy a 2 liter for about 2 dollars. But to show that prices are made up and don't really matter, a 1.5 liter bottle was 1 dollar...