Paflechien So I'm wondering: we need play services to run our banking applications for security reasons
Not for security reasons, Google Play services will not increase your security
Paflechien I've heard of a 2fa protected youtube account being hacked, it was hacked because of a cookie
The cookie was stolen because the victim downloaded malicious software on a Desktop OS.
Paflechien But if a cookie can be hacked, what's Google's point?
An app can't steal cookies from another app on Android. An app also don't have to use cookies or even WebView.