1) The absurd price increases are not limited to touristic areas. I have a friend whose grandmother lives in Zagreb and witnessed it there too.

2) Price increases depend on the merchant and the level of scamming they want to enforce : a bottle of water (same brand) can have a price delta of up to 1e in the same area

3) How do you explain that a ride using uber cost me 4e instead of 18e had I used a classic taxi ?

4) Restaurants' old menu cards denominated in Kuna from one year ago (that you can find in google reviews) showcase the absurd price increases

5) There is no way that a double espresso would cost me more in Split than in Champs Elysées. No way.

It's not only a demand/supply dynamic that pushes prices up. There's definetly scamming of unsuspecting tourists with higher purchasing power (people from France, Germany, Austria, UK...) going on.