Data protection law, including the General Data Protection Regulation (GDPR), usually requires a privacy policy before data can be collected from individuals. We analysed 15,145 privacy policies from 26,910 mobile apps in May 2019 (about one year after the GDPR came into force), finding that only opening the policy webpages shares data with third-parties for 48.5% of policies, potentially violating the GDPR. We compare this data sharing across countries, payment models (free, in-app-purchases, paid) and platforms (Google Play Store, Apple App Store). We further contacted 52 developers of apps, which did not provide a privacy policy, and asked them about their data practices. Despite being legally required to answer such queries, 12 developers (23%) failed to respond.

翻译：我们分析了2019年5月26,910个移动应用软件的15,145个隐私政策(在GDP生效大约一年后),发现只有开放政策网页才能与第三方共享数据48.5%的政策,这有可能违反GDPR。 我们比较了各国之间的数据共享、支付模式(免费、内购、付费)和平台(Google Play Store、App App Store ) 。 我们还联系了52个应用程序开发商,这些开发商没有提供隐私政策,并向他们询问数据做法。 尽管法律要求他们回答这类问题,但12个开发商(23%)没有答复。