AdMob mediation/bidding in Defold: are we limited to a small set of supported networks?

We’ve recently integrated AdMob in our Defold project and enabled bidding/mediation. Right now we have these partners connected:

  • Meta Audience Network

  • ironSource

  • considering adding Unity Ads SDK (next)

I’m trying to understand what the real limitation is on Defold’s side.

From what I see, AdMob supports a bunch of networks, but in practice (especially with Defold native extensions) it feels like only a limited number of networks are “easy” to use because you need the correct mediation adapters (Android/iOS) included in the build.

So my questions:

  1. With Defold + AdMob, can we use any AdMob-supported mediation/bidding partner as long as it exists in AdMob, or are we effectively limited to the networks that are already packaged/maintained in the Defold AdMob extension?

  2. If we want to add a new network (e.g. Unity Ads), is the correct approach to rebuild/modify the native extension to include the required adapters (Gradle deps on Android / frameworks or pods on iOS)?

  3. Are there known platform-specific limitations (iOS vs Android) for adding extra mediation adapters in Defold builds?

  4. If someone has done this successfully: what’s the recommended setup today (AdMob-only mediation vs using ironSource as mediation, etc.)?