> i do kinda get why they're very protective.

I am not sure if a typical Android with a bunch of (preinstalled!) crappy apps is more secure than a GNU/Linux phone relying solely on FLOSS repos.

Changing banks can be easier or harder, depending on your country. People do it: https://news.ycombinator.com/item?id=40678203

isn't it just about banks not wanting to open-source their apps or connection details for supposed security or other reasons?

> changing banks can be easier or harder

well the process of changing banks is not the problem, i did leave UBS and Credit Suisse a couple of years ago. but now i'm with a bank i specifically chose because they're actually not financing wars or other unethical things, instead of just saying so for greenwashing purposes. this aspect is more important to me than them open-sourcing their infrastructure.

> isn't it just about banks not wanting to open-source their apps or connection details for supposed security or other reasons?

Not exactly: https://news.ycombinator.com/item?id=40715542

https://news.ycombinator.com/item?id=40714796

Indeed, finding a bank reasonable from every side is much harder.