Android is sending a ton of data, though, even if you’re not doing anything internet related. It, also, kinda reacts to “okay, google”, which wouldn’t really be possible if it wasn’t listening.
Now, it obviously doesn’t keep a continuous, lossless audio stream from the phone to some google server. But, it could be sending text parsed from audio locally, or just snippets of audio when the thing detects speech. Relatively normal stuff to collect for analytics purposes, actually.
Now, data like that could “easily” get “misplaced”, of course, and end up in the ad-shoveling machine… Not necessary at Google’s hands: could be any app, really. Facebook, TickTok, random free to play Candy Crush clone, etc. But if that data gets into the interwoven clusterfuck of advertisement might, it will likely end up having an effect on the ads shown to the user.
Well, why would banks replace the system which allows them to charge fees for every other interaction with their services? A blockain solution would allow multiple different banks (and, possibly, even regular people) to access the data with no middlemen, and, therefore, no fees. Or, well, no fees that directly end up in the bank’s pockets as profit, that is.
Getting rid of that is bad for business. So, unless something magical happens and the EU, for example, pass a law requiring the banks to switch to a more de-centralized, more fair system, it’s not going to happen.