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by bonn1 4140 days ago
If your LTV > CAC then yes.

LTV = Lifetime Value of your customer

CAC = the customer acqusition cost

Since the CPC on AdWords are quite high and finally the resulting CAC will be also quite high (still depends on your conversion) you need a product with a high LTV. I don't know how much LTV you try to achieve with HackerEarth but it should above be $100.

Cheaper channels: affiliate (so CPA based deals) or SEO