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/e/ is just another edition of Android, like FPOS. However it’s significantly de-Googlized and doesn’t come with Chrome and all the Google-Somethings you get with the stock OS. A refreshing change, I’d say. You can still use your Gmail messaging, and even access web-based Google services if you wish.
I’d say, yes. Some purists dispute this, but I think the best anti-malware out there is simply users’ caution and common sense.