Since it's closed-source, privately owned and not based on any open standards, it doesn't work on Linux or any mobile device that isn't using Google Play Servic

Since it's closed-source, privately owned and not based on any open standards, it doesn't work on Linux or any mobile device that isn't using Google Play Services or iOS. It's convenient, but it's an absolute travesty that we've left such an essential part of digital infrastructure to big banks.