Wouldn’t it be simpler for European countries to simply raise the VAT and redistribute the proceeds to poor people, rather than regulate the interchange fees if the concern is inequality
VAT is a regressive consumption tax. Raising VAT, hurting poor people the most, skimming a bit off the top and then "redistributing" it back to them would make no sense.
Do you mean a higher corporate tax paid by companies like VISA and Mastercard?
Either way, the solution is already on the horizon: Digital Euro.
Your solution sounds significantly more complicated actually.
So.. you’d have both higher taxes and higher interchange fees? What’s the appeal of that?