Update: This issue is, unsurprisingly, a lot more nuanced than the video here lets on. The bug is based in the stock Android browser, is in fact quite old, and has been patched in more recent builds of Android - this is probably why Nexus devices running the most recent OTAs are unaffected. The fact is, this is not a Samsung problem, it's an old Android problem that has been known about for some time. More recent versions of Android avoid the wipe issue, but unpatched devices (like some Samsung phones) may still be vulnerable.