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Apple has added extra paid-for advertisements to its App Store, a week after its new operating system limited tracking for ads from other companies.
The new ad space lets app-makers advertise on the App Store search tab, rather than just in the search results.
Last week's release of iOS 14.5 placed strict limits on tracking on iPhones – including tracking for advertising.
And Facebook fiercely opposed the change, warning it would favour Apple's own advertising system.
Apple's App Tracking Transparency feature requires apps on iPhones to ask for permission to track the user for advertising.
During a long-running row between the two, Facebook had warned Apple's "privacy" features would hurt advertisers – including app makers – and benefit Apple.
"Apple's policies leave very limited options for app developers to find customers through effective advertising – and, conveniently, Apple's own advertising products is one of them," Facebook had said.
Previously, Apple sold adverts to appear at the top of search results only. The new slot effectively doubles the advertising space for sale.
Enders Analysis senior media analyst Jamie MacEwan said: "The timing makes sense.
"Apple probably anticipates increased demand for exposure on the App Store. That's because Apple's iOS privacy changes have made other options less attractive."
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Ad campaigns on other sites had less reliable measurements of success, he said.
And app developers ran ads only if they were sure the cost of winning new customers was lower than the amount they would spend on the app.
"As its ads business grows, Apple will have to make sure its execution on consent and privacy is impeccable" to avoid accusations of putting itself first, Mr MacEwan added.
Some reports suggest Apple's ad sales could be worth more than $2bn and are growing.
Apple has not responded to a request for comment on the timing of the new advertising product launch.
The new feature also comes as internal Apple emails reveal a tension in the company over its advertising business.
The emails, between Apple employees in 2015, discussed the possibility of adding adverts to the App Store, after Google launched them for its own Android store.
The documents emerged as part of Apple's continuing legal battle with Epic Games and were first reported on by Apple news site 9to5Mac.
image copyrightReutersimage captionThe Epic v Apple case has made public large numbers of internal company documents
Apple anti-fraud unit head Eric Friedman was discussing the idea of ads with engineer David Neumann, the documents reveal, and how they could work better for app discovery than a "top apps" chart.
"The dev[eloper]s would love it," Mr Friedman wrote.
"The problem is that [Apple chief executive Tim Cook] is telling the world that we make great products without monetising users.
"Ads would be weirdly at odds with that."
Mr Cook has long criticised big technology companies for monetising users' data, whereas Apple makes most of its money through selling high-end devices.
Apple ended up introducing its first App Store ads in mid-2016, more than a year after those emails.
But the number of ads it displays remains low compared with rival Google Play, or most social networks.