Re:Google resists demands from states in digital-ad probe
by Middleclass on Friday February 21, 2020 @11:23AM
(#22384290)
It is incomplete because Google Play Services contains functionality closed to developers, unrelated to the free online services provided by Google.
Your point stands, nevertheless.
I'm not sure that third party app stores would really address much at all as far as the nature of Google's competitiveness.