Admob is a PRO feature, so yes, you need a membership to use it.
I don’t use Admob, but the documents indicate several options, not just banner ads. See (choose the appropriate one for which version of the designer you’re using):
There are more ad
mob futures in the block section.
And to Publish and Download with admob you need to have a PRO subscription.
Because They are invisible Components.
They have moved to the block editor.
Since your using DnD.
You have to pay money to make money.
That’s just thunkable for you 