Google Play Protect, a malware protection system that comes pre-installed on official Android devices, has blocked more than 1.9 billion malicious app installs that originated from unofficial (non-Google) sources in 2019, such as third-party app stores. The number is up from 1.
https://www.zdnet.com/article/play-protect-blocked-1-9b-malware-installs-from-non-google-sources-last-year/#ftag=RSSbaffb68
https://www.zdnet.com/article/play-protect-blocked-1-9b-malware-installs-from-non-google-sources-last-year/#ftag=RSSbaffb68