Do you mean that creators choose explicitly how many ads to insert and their length? Because if it's just an ON/OFF switch and then Youtube proceeds to put almost equal lengths of ads than of content (1+ min ad after 2 minutes of content, as per the previous comment) then that's truly terrible.

Also... ads after only 2 minutes? Am I the only one who thinks that feels much worse to bear than longer ads more spaced out? There's something that feels odd with having to get interrupted by an ad after mere 100 seconds of watching something.