An advertisement does not have to cost money to cost the user something.
It can cost twelve seconds.
Then another twenty.
Then the interruption required to remember where the video left off.
That is why advertising density is better measured in attention and task interruption than in rectangles on a page.
YouTube provides a documented example of the available ad surface expanding over time.
Mid-roll inventory became available on shorter videos
Before July 2020, YouTube’s mid-roll ads were limited to videos longer than ten minutes.
TeamYouTube announced that the threshold would drop to eight minutes. Eligible existing videos could have mid-rolls enabled, and new eligible uploads would have the feature enabled by default unless creators changed their preferences. See TeamYouTube’s 2020 explanation of the mid-roll change.
The practical result was simple:
A larger share of the video catalog became eligible to contain advertising inside the program rather than only around it.
That is an increase in possible ad density even though not every available slot necessarily serves an ad.
The machinery kept gaining more places to work
YouTube’s current ad documentation lists pre-roll, post-roll, skippable, non-skippable, bumper, mid-roll, feed, Shorts, and other formats. Long-form videos can also receive ad pods, meaning two back-to-back video advertisements in one break. See YouTube’s advertising formats documentation.
In 2025, YouTube announced another mid-roll change: for existing monetized videos that already had manually placed mid-roll slots, the company would add automatic slots by default unless creators opted out. YouTube said combining manual and automatic opportunities could increase creator earnings. See TeamYouTube’s 2025 mid-roll update.
Again, an ad slot is not a guarantee that an ad appears.
But more eligible videos and more eligible slots create more opportunities to sell attention.
The user pays in interruption time
Suppose a 20-minute tutorial once contained one interruption and later contains three.
The monetary price to the viewer can remain exactly zero.
The experience still changed.
Useful measures include:
- ad minutes per hour watched,
- interruptions per video,
- number of consecutive ads,
- time before content begins,
- screen area occupied by ads,
- clicks required to dismiss or skip them,
- and whether paid removal is available.
Those measures are more meaningful than simply declaring a site “full of ads.”
More ads can fund something real
Advertising pays creators, infrastructure bills, licensing costs, moderation teams, and the platform itself.
More inventory is not automatically evidence of platform decay.
The Enshittification question is about the exchange.
If advertising increases, what improved for the user in return?
If nothing improved, the platform may be extracting more attention from an audience whose reasons for staying were built earlier.
That is the measurable form of the complaint.
Not there are ads now.
But the same task now requires surrendering more of your time to the platform’s revenue machinery than it used to.