Not bashing on this thread, but making expecting bitcoin off faucets or anything with minimal work will not get you anywhere.
But, the difference with it is if you do use these sites. Get a chance at looking at a better plan for referrals, thats a different story.
The hardest part like anything will be getting referrals, but thats up to your plan to decide.
Eg: paying people for referrals, etc.
Keep in mind that the whole point of building it would be passive stream of bitcoin. And know when to continue your efforts since you dont want it to die out.
Building a big and active referral tree can be a well-paid job but it requires much devotion and above all many hours spent on it.