Even the EU initiative Wero requires Google or Apple. You can't even use it on a desktop pc and you're not even allowed to have developer options on. Ridiculous. I've never seen any app that is so strict.
Weird, because Wero is an internationalization of the dutch iDeal and that worked fine without any apps. You clicked ‘continue to bank’, select your bank, and then login on the bank web portal.
That's not exactly right, Wero the app is not Wero the payment system. Banks and payment processors are expected to integrate Wero the same way they do with iDeal and similar systems. So ultimately if your bank's app doesn't require attestation you will be able to use Wero through it.