I don't even use Krita, but donated €15 anyway, just because I know what it's like to deal with the utter shitstains at the VAT department of the Dutch tax service.
As someone who recently paid 200€ in fines to another EU tax authority over 150€ in income, of which I was exempt, just for marking the wrong box, I can sympathize. Just made a small donation.
SEPA transfers are usually free for personal accounts, be it sending or recieving, but business accounts usually charge a < 10 cent fee for recieving a transaction.
But if your country doesn't use the Euro (i.e. the UK), domestic Euro transactions can be more expensive than domestic transactions in the home currency.
Otherwise, for people in the EU, our bank account is ING, BIC: INGBNL2A, IBAN: NL72INGB0007216397 .