This doesn't happen on Android. Why would it happen in iOS?
Discoverability and the ease of access that the playstore/appstore provides is enough to pretty much always want to have your app up there.
The main difference is that there are a lot of apps that are simply not allowed in the appstore or that you need to change substantially to comply with apple's rules. For example, Telegram has censored content if you download the app from the appstore given Apple's pornography laws. Other apps that might be used to infringe on copyright are outright not allowed (they're also not allowed on the playstore, but you can install them from the apk or a third party store).
Now, maybe you think these restrictions are appropriate and that's fine... for you. Other people might want the freedom of doing more with their devices that they paid hundreds and hundreds of dollars for without having to resort to extreme measures. The argument Apple uses is bullshit and the EU saw through it.