Maybe you can think that similarly like we prefer to support Itch, we also prefer to support the society by doing the right thing and paying taxes :) A happy taxpayer, and also happy soaring little hiking bird here ;)
As explained above, YOU are paying the correct rate of tax (20% VAT) whether you buy it from Itch or Steam, no preference involved. It is the game's base rate (chosen by the developer) that is different, suggesting the product has been setup incorrectly on one of the two store fronts.
