Unless I am missing anything, Commerzbank has a small text on some of the sites "Using HBCI? This is how to activate". That's hardly advertising, nobody how doesn't already knows what this is about will click on that. All their interactions on the site seem to steer people to mobile or photo TAN.
To me it looks like nobody actually uses the Personalausweis online. Just recently, companies have switched off their support (e.g. HUK or DKB). And the majority of the readers around are just RFID readers without any dedicated keys or display (which obviously is not a secure way) which can't be used for HBCI.
To me it looks like nobody actually uses the Personalausweis online. Just recently, companies have switched off their support (e.g. HUK or DKB). And the majority of the readers around are just RFID readers without any dedicated keys or display (which obviously is not a secure way) which can't be used for HBCI.