Okay, but that's a different discussion. Google showing Google Maps first instead of Apple Maps on a search for "maps" is not related to the kind of shadowy political subterfuge you're referencing here.
I still don't see what's wrong with highlighting your own products to your customers, which is the discussion here.
It kind of has: https://maps.apple.com/place?address=San%20Francisco
So it does have a way of accessing the maps over the web. But because they dis-allow locations they don't compete with google for location based queries.
Everyone is wrong or right, depending on if your glass is half full or empty.
Replace "maps" with the names of any competing products from both companies with a web presence that can be linked to in search results, if you want to genuinely rebut the point.
What is a similar measurement for information? Grocery stores only sell physical goods; they don't, for example, determine what medical information you see, or what information about political candidates you consume... those are things that search engines do.
So you see why this could be "worse" and "wrong": there isn't a good way to measure the impact and the scope of influence is much larger.