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Opensource games, safe or just as vulnerable as web browsers?
(lemmings.world)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Assuming the worst, they might inject ransomware or other highest threat level malware to your system. Though it's extremely unlikely and the kind of app doesn't really matter as long as it's popular.