So when another new, shiny app made by some walled garden company shows app, bank should enforce that instead? My bank is using mobile signature(1) and I think

So when another new, shiny app made by some walled garden company shows app, bank should enforce that instead? My bank is using mobile signature(1) and I think it's way superior to any app, because the encryption part is done inside SIM which has quite good security record. There's simply no way I would trust Facebook (via WhatsApp) with my financial data. 1. https://en.wikipedia.org/wiki/Mobile_signature https://en.wikipedia.org/wiki/Mobile_signature