As I said in another comment:

Also most people don’t sit there in meetings with their finger on the screenshot key ready to go - but it is simple to just press a screenshot key on your keyboard. It’s a little bit harder to have your phone up and with the camera open the entire time ready to take photos, especially if cameras are on - especially if something just pops up briefly on screen and you realise you want to capture it.

This is only going to keep honest people honest.

It's going to keep the overwhelming amount of people "honest", and it's going to give companies an extra tick box on any security audits that are integral to the company doing business.