Sander I can understand mapping an existing logo is less work, but it's just odd to ask me as customer. I would assume I'm not the first one to pay at (let's say) Praxis. How can I know of anybody else already made the effort to send bunq a link to their logo? So you'd only have a very low probability that someone is going to say "yes" or a lot of people who think it should already exists but it doesn't. And then you still have no logo because they didn't bother to find one becasue they think it should already be in the app.
When there was a big Google Sheet you could actually see which logo's were submitted before and it made sense to ask, but with the new form you can't see which logo's have been submitted.
Nobody would assume copyright notices to appear in their banking app or on their banking statements (ssssssh, the laywers might hear) but I'd say that would change with a logo repository on a public server.