Researchers at Lookout found that the BeiTaAd library, popular among Android application developers, began to display aggressive advertisements. The library worked in 230 applications from the Google Play Store. Over the past year, their total downloaded 440 million users.
Overly aggressive advertising in an application worsens the reputation of its developer. Firstly, it violates the policy of the Play Store, and secondly, annoys users who blame the creators of the application.
As of May 23rd, 2019, the 230+ affected applications on Google Play have either been removed or updated to versions without the BeiTa Plugin.
Security Intelligence Engineer, Lookout
Previously, BeiTaAd helped display unobtrusive ads. In 2019, it somehow changed the policy. Lookout notified Google about the problem, and she contacted the developers.
Developers trusted this library, since its author is the legitimate Chinese company CooTek. You can know this company from the TouchPal app, a custom keyboard that has been installed by more than 100 million users.
This situation put developers' reputation under the thread, due to the fact they haven't even know about such an issue, and users were angry on them.