I believe the poster was referring to the practice of testing if an app was inst... | Hacker News

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		robterrell on Sept 24, 2021 \| parent \| context \| favorite \| on: Disclosure of three 0-day iOS vulnerabilities I believe the poster was referring to the practice of testing if an app was installed by calling [UIApplication canOpenURL:] —- as I recall Twitter was found to check for hundreds of different apps, to feed into their ads and analytics business, and Apple later changed it to only be callable 50 times.

saagarjha on Sept 24, 2021 [–]

Nit: for 50 different schemes, not 50 times.

MrGando on Sept 24, 2021 | [–]

And you have to provide those schemes in your App's plist as well if I recall correctly. Gated pretty hard.

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