Earlier quoted context omitted.
Yeah, running GrapheneOS, this has been a big headache for me. And it's incredibly stupid too. The app won't work natively due to a lack of attestation, so I have to fire up the browser and user the service.... Exactly how is that more anti-abuse than just using an app without attestation? It's security theater and has no basis in reality.
Can you scan a check from your web browser? Maybe I'm wrong, but probably not; frankly, it's a logistical miracle we can do this from our phones and the banks tolerate it, but I can see why they would still want to minimize all risk involved. The second reason though I can think a bank would want attestation is as an anti-piracy measure. With a website, you have HTTPS verifying the identity of the domain. With an app…
I don't think this happens nowadays. Android will either block by default or give you a million prompts and warnings before it allows you to install an apk from an unknown source. It's far, far easier to install it from google play. I don't think any grandmother would manage to accidentally ignore the first 3 pages of genuine links on google and then push the right buttons that enable sideloading.