Feel free to say you are a member of the Church of Cryptography and that installing proprietary corporate controlled apps is against your religion.
Never been asked to install an app for banking, but a health care clinic dropped me as a patient for not buying a phone that can install their app. I was the first case where a patient refused to conform. Found a new clinic who was willing to earn my business with phone and email correspondence. The original clinic escalated the case to corporate HQ when I filed a public medical malpractice complaint, and they ultimately responded by adding a webapp.
DEMAND the right to live your life without corpotech in your pocket. I am now 5 years without a smartphone working as an engineer and founder with an active social life who frequently travels and it can absolutely be done.