Why is engagement you didn't earn worthless to advertisers?
The clearest verdict on bought engagement comes from the people who spend the most money on attention: advertisers. To them, engagement you did not earn is not just less valuable — it is worth nothing, and sometimes less than nothing.
An advertiser is paying for one thing: the chance to reach real people who might act. A follower who is a bot cannot see an ad, click a link, or buy a product. So every fake follower in an audience is dead weight the advertiser has to pay around, diluting the pool of real people their money can actually reach.
This is why serious advertisers and platforms optimize against your real audience and price accordingly. A creator with a bloated fake base often gets worse ad results and worse partnership terms than one with a smaller, clean audience — the numbers that impress a naive buyer are the exact numbers a sophisticated one discounts to zero.
It also explains why engagement rate, not follower count, is the metric that gets you paid. Rate is the share of your audience that actually responds, and it is hard to fake upward — buying followers pushes it down. The people writing the checks know this.
Earned engagement is the only kind that converts to money, because it is the only kind attached to real intent. Measure yours with analytics tools.