In Europe there are, e.g. at least some subsidiaries of Societe Generale, which have closed their Web sites on which their online banking services were previously available, and which refuse to provide their mobile apps otherwise than through the Google Store.

I doubt very much that it is possible for this practice to be legal, i.e. to condition the services of an European bank of the existence of a contractual relationship with a third party, which is non-European.

Nevertheless, nobody has enough spare time and money to challenge legally such banks.

Now I do my operations mostly through other banks that still have browser-based online banking, but I have not closed yet my last account at such a Societe Generale subsidiary, because I have regressed to use an antique SMS-based substitute for online banking, which is good enough for that account, which I keep only for a credit card used mostly for shopping in supermarkets or the like.