I would really like a difinitive answer to this question. Is there any way to find our for sure? Not only if you stop earning from HubPages if you lose your Adsense account, but do you lose unpaid earnings?
Definitely not. Your adsense earnings here at HP reflects it as earnings in your personal adsense account. That means if it's disabled or disapproved or blocked, you won't be earning anything from the clicks you're getting in your hubs.
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