I use F-Droid everyday to install and manage apps outside the Play Store and it works out fine for me. Android is also open source. If I don't like the way something is done then I'm free to change it, and there are multiple ROMs that I can choose from as well.
Good luck with the “open source” version of Android and running apps that depend on Google Play Services.
Like what apps? If I need something that depends on Google, there is always this:
Because Google had scary warnings that downloading Fortnite from outside the App Store my lead to security vulnerabilities. Where did they ever get that idea from?