NuGet packages added to my project that are not referenced - xamarin.forms

Question

When restoring NuGet packages I see that Xamarin.ios.CameraViewController is restored to my package and with it, all its dependencies. But I never referenced Xamarin.ios.CameriaViewController nor it is a dependency of my referenced packages.
My csproj nuget references:
<ItemGroup>
<PackageReference Include="Acr.UserDialogs">
<Version>7.0.3</Version>
</PackageReference>
<PackageReference Include="CarouselView.FormsPlugin">
<Version>5.2.0</Version>
</PackageReference>
<PackageReference Include="DLToolkit.Forms.Controls.FlowListView">
<Version>2.0.11</Version>
</PackageReference>
<PackageReference Include="GMImagePicker.Xamarin">
<Version>2.3.2</Version>
</PackageReference>
<PackageReference Include="Microsoft.Net.Http">
<Version>2.2.29</Version>
</PackageReference>
<PackageReference Include="Newtonsoft.Json">
<Version>12.0.1</Version>
</PackageReference>
<PackageReference Include="Plugin.FacebookClient">
<Version>1.4.0</Version>
</PackageReference>
<PackageReference Include="Plugin.FileUploader">
<Version>1.4.0</Version>
</PackageReference>
<PackageReference Include="Plugin.GoogleClient">
<Version>1.1.0</Version>
</PackageReference>
<PackageReference Include="Remote.Linq.Newtonsoft.Json">
<Version>5.8.2</Version>
</PackageReference>
<PackageReference Include="Rg.Plugins.Popup">
<Version>1.1.5.188</Version>
</PackageReference>
<PackageReference Include="SQLite.Net.Async-PCL">
<Version>3.1.1</Version>
</PackageReference>
<PackageReference Include="SQLite.Net.Core-PCL">
<Version>3.1.1</Version>
</PackageReference>
<PackageReference Include="Syncfusion.Xamarin.SfAutoComplete">
<Version>16.4.0.54</Version>
</PackageReference>
<PackageReference Include="Xam.Plugin.Connectivity">
<Version>3.2.0</Version>
</PackageReference>
<PackageReference Include="Xam.Plugin.Media">
<Version>4.0.1.5</Version>
</PackageReference>
<PackageReference Include="Xam.Plugins.Forms.ImageCircle">
<Version>3.0.0.5</Version>
</PackageReference>
<PackageReference Include="Xam.Plugins.Messaging">
<Version>5.2.0</Version>
</PackageReference>
<PackageReference Include="Xamarin.Essentials">
<Version>1.0.1</Version>
</PackageReference>
<PackageReference Include="Xamarin.Forms" Version="3.4.0.1029999" />
<PackageReference Include="System.Reflection.Emit">
<Version>4.3.0</Version>
<ExcludeAssets>all</ExcludeAssets>
</PackageReference>
<PackageReference Include="Xamarin.Forms.ImagePicker">
<Version>1.0.0</Version>
</PackageReference>
<PackageReference Include="Xamarin.Google.iOS.SignIn">
<Version>4.4.0</Version>
</PackageReference>
<PackageReference Include="Xamd.Plugins.Forms.ImageCarousel">
<Version>1.0.2</Version>
</PackageReference>
<PackageReference Include="Xfx.Controls">
<Version>1.1.3</Version>
</PackageReference>
</ItemGroup>
So why is it referenced? how can I remove it?

Answer 1

It's a dependency of Xamarin.Forms.ImagePicker.iOS, which is a dependency of Xamarin.Forms.ImagePicker.

Answer 2

with package references being maintained in the project file, only
top level dependencies are listed there, i.e. packages you have
explicitly added.
Now, packages can depend on other packages. These
package become your transitive dependencies - Packages that you did
not add explicitly but now you depend on them implicitly.
Most times you don't care too much about them which is why they don't show up in
the list of installed packages i.e. top level dependencie.
You can however, take a look at all your dependencies inclusing transitive ones -
open the obj directory for your project. You'll see projects.assetes.json You'll see something like
"Microsoft.NETCore.UniversalWindowsPlatform/6.2.8": {
"type": "package",
"dependencies": {
"Microsoft.NETCore.Platforms": "2.1.0",
"Microsoft.Net.Native.Compiler": "2.2.3",
"Microsoft.Net.UWPCoreRuntimeSdk": "2.2.8",
"NETStandard.Library": "2.0.3"
}
In that example, Microsoft.NETCore.UniversalWindowsPlatform is a package that you installed explicitly and would see in your csproj references but it also brings in a bunch of its own dependecies i.e. Microsoft.NETCore.Platforms, Microsoft.Net.Native.Compiler, etc.