Yup! I feel your pain my brother app developer.
Same here. Subscribe Construct 3, started small project but unable to publish to Google Play Store with signature, admob and earning a little bit of dollar. (or did I miss any tutorial?)
Really hope Scirra could sort this out.
They should alert this before you buy the product
"You can make games, but you won't be paid for that"
What a shame... There is some way to get my money back? I bought this to make money, it's not a hobby