1. Support self-custodied 2FA: TOTP/U2F. Do not require phone-number/SMS "for your own protection".
2. Be honest with your customers and users. Don't succumb to dark UX for the sake of control, engagement and growth. Allow setting separate notification settings for marketing/"news"/functionality/security, and don't silently add and enable new marketing channels.
3. Full functionality even on devices without Google Play Services/SafetyNet/Apple. Preferably I should be able to do everything through the web UI, without requiring involvement of a native iOS/Android app.
4. Adhere to a strict interpretation of the GDPR, regardless of where users/customers are geographically residing or located; No sharing PII with third-parties (above what you are legally required to do). No loading assets from third-party servers.
5. Allow access over anonymized channels (mainly tor/paid VPNs)
A pinky promise on the above would make me sign up and recommend you to my network in a heartbeat. Would also be very curious to hear if you agree with me that the above are completely reasonable requirements/requests or if any of them stand out as something you may not be able or willing to do.It looks like you're aiming for a USP of competitive fees but I think I'm not alone in being very happy to not get the absolutely cheapest rate compared to Wise/Revolut/Paypal/N26/PS/MG et al if you stay aligned with the above.
/ Someone who's fed up with the existing landscape