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YouTube's ad problem just got worse: Users now seeing 90-second unskippable ads!
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Maybe your grandma who doesn't understand that, shouldn't be installing unverified apps without someone like yours guidance? That's not a hard concept if they're going as far as installing something else not from a store.
You'd still need "developer mode" to install f-droid or epic games apk.
People shouldn't be scared or intimidated out of installing non-google store fronts.
...but yes, Grandma should avoid random apks pulled from the internet.