>>Macha+(OP)
It's going to be much less of a problem for everyone, with these draconian Play policies, as I imagine more and more people will be installing F-droid.
>>SomeHa+wG
as far as i know f-droid is using the same mechanism to install apps as would any other app (though i remember reading that this wasn't always the case and that it switched to the standard mechanism at some point), like a filemanager. either an app can invoke the installation or it can't. there should be nothing in f-droid that would make installation any different.