Ingo I know that some banks are free, but I don't think that you know why they're free 😉
Banks like Revolut/N26/etc. earn from the free subscription through 'interchange fees' (for every successful physical card transaction made, Revolut/N26/etc. and Mastercard receive a discount), international transfers (cost 0.5%), partnerships, transaction fees for buying shares, and lending to other institutions for interest income (which is also something banks like ING do). You see: free is never really free.
Bunq does not do most of these things. For example, bunq only deposits your money with the European Central Bank and does not do anything crazy with it (one of the reasons I chose bunq as my bank). If you want to receive interest, you can choose what you want bunq to invest your money in. So yes, you could go to a bank with a free plan if you don't care, but for the people who do care; they're happy to pay a little bit extra at bunq, because they do not do anything strange with your money in order to offer a free subscription.