So, you have rabbit teeth^^
A stupid question: In the background on the left side, are those windows with little windows inside??
edit
ok, I just read the whole post to the picture. Very interesting. This replacement of ads on a systematic level is a kind of cannibalizing of 3rd party content and raises the question of the legality. Normally, I would say there is no issue, because you can also put advertisements around a TV on which a football game is shown. But with the intentional removal of ads and therefore nullifying the business model of the host is actually bordering so close to being shady, that I wouldn't be wondering when Youtube sues Brave for that. Do you have any information about the legality of that "trick"?
Those are called jalousie windows you may google it to know more about them.. and yeah i have rabbit teeth lol ... about the advertising thing i am not sure maybe if there are some issues about it i am sure Google will contact them first.
Oh those are aluminum screens and the ones you are pointing too are access windows so that we can close the windows via its levers.These are really old designs.... okay who :)
Or better yet they might think it is a brilliant model and buy them out.
The "pay to view ads" model is very prone to ad fraud from bots viewing the ads. The reason this model is different is because they'll have solid programming in place to prevent fraud like this, so when someone pays to show you an ad, they can be pretty confident it's actually a person viewing the ad, not a bot.