Interestingly, the AU price was a couple dollars more than the US price. Threw together a quick side-by-side: https://imgur.com/a/DJwG5z9
Same goes for hotels + resort fees, though. It seems like the only place I can really see the actual price is on airline websites?
EDIT: I just tried to repro and now the total is always matching. I swear I was just raging about this 4 days ago when I booked a trip... gah.
But I do agree, the fees are generally a higher percentage.
You may encounter a city tax of a couple Euro in most European cities as an add on, but nothing in the range of dozens of Euro.
I think it's nothing less than a scam and should be made illegal. Period.
Hotels are on Booking.com and to a lesser extent AirBnb.
They often charge parking fees and wifi fees too.