I'm not necessarily talking about the product itself getting better, I'm talking about the overall consumer situation being better.

All these products were acquired very early in their lifespans, so them getting "better" was practically inevitable.

GitHub's acquisition effectively took at least one competitor off the market. Now, Microsoft doesn't have to seriously develop a competitor, they just bought their competitor and adopted it. They never had to improve Azure DevOps (VSTS) enough to be attractive, they just bought the market leader. If GitHub was never acquired, my company might be deciding between BitBucket, Gitlab, GitHub, and Azure Repos. Instead, Azure Repos is more of a niche offering where most of Microsoft's effort has focused on GitHub. Microsoft removed an option which likely raised prices or reduced user choice.

Google Maps was acquired in basically a prototype stage before it was ever a public product, so that case is irrelevant.

Android is worse in a number of ways due to Google's integration. Google Play Services APIs and other Google technologies have led to heavy Google lock-in. If Android continued as its own project, it would have been much more vendor-agnostic.

In the case of YouTube, I'd argue it's worse in a number of key ways: ads are wildly pervasive (sure, monetization would have had to happen anyway in some fashion), many of the platform changes are user-hostile (removed dislike count, background playback limited to premium subscription), content moderation more heavily influenced by Google's advertisement-based business model (e.g., if YouTube had continued on its own, it might have chosen a different monetization strategy less advertisement oriented, but Google is an advertisement company. Advertisers are more sensitive to their products being presented next to objectionable content) and competitors were snuffed out due to ecosystem integration (YouTube videos as Google search results rather than agnostic video results).

Remember the era where YouTube got extremely badly integrated in to Google+ and basically forced you to use it? That was a pretty terrible user experience.