I find that banking apps deserve that extra bit of anger pointed towards them. (It’s also increasingly hard to find an ATM in many countries. What are banks up to?)
The thing is, people like GP don't seem to realize that holding their money is not much of an asset to these banks. Like, at all. Maybe no that interest rates are higher. But in general, you're not doing them any favor. My understanding is that holding retail money is a loss leader for most banks. Unless GP is ultra wealthy, they're not doing the bank any favors by giving them their savings or whatever.
Banks do spend a lot on marketing to acquire a given customer, and will then upsell that customer on more profitable products like loans and credit cards. But having a high customer acquisition cost and then upselling is not quite the same as being a "loss leader" (which sort of implies that marginal profit is negative, which is definitely not true).
Was it not when interest rates were low, like when LIBOR was near zero? My understanding of that era was that many retail banks were working to shed retail deposits. Holding money was not profitable in that era, especially retail. And today I would still suspect it's not what banks are going for big picture.
Tell that to Vanguard or Fidelity. Two of the largest 'money holders' in existence, and probably the two worst financial apps I can think of.