There is, called MicroG. Although personally I don't use it on my google-less phone because it's a bit messy/early in development.

You can make do (as I do) with LineageOS, F-Droid, and APKMirror. The last is run by the AndroidPolice folks and is therefore trustworthy.

True Samsung's not any better, but diversity is a good thing; if they have an alternative in place then they could much more easily provide competition with Google in this space (after all, Samsung sells hardware and doesn't really need to harvest your data)