I imagine in this sector more than most there's a strong temptation to amass a huge safety net so you can ride out getting "disrupted". As a leftist Keynesian I don't particularly like it-- seeing all that money sitting there doing nothing drives me crazy-- but I understand the motivation.
Seems like Apple's money is invested in a diverse portfolio of equity markets: http://www.zerohedge.com/news/2012-09-30/presenting-worlds-b...
They do get disrupted. By themselves
If Apple manages to continue to do that, then they will go on
That last one can be huge - if none else can build certain components for the same cost/volume as Apple then that's a key competitive advantage.
Break into a capital intensive industry.
Then there are things like charging for deposit slips and other necessary forms, and their online presence is terrible. I can't pay bills between 2AM - 7AM because: the system is down, or my loan balance is $0, or isn't in US funds anymore. WFT?! And the security is laughable (at least for a bank). When will they incorporate MFA? I think this is where Apple could really shake up the world, just like they did with cell phones and GUI computers before then.
[0] https://news.ycombinator.com/item?id=11373605
[1] http://www.antipope.org/charlie/blog-static/2016/03/follow-t...
When you take a company private you have to bring in money from the outside, either using investor groups or borrowing.