The very small amounts the faucets give is not the only problem. One has to also be careful with the withdrawals because if your wallet has a lot of inputs it can become very expensive to spend or consolidate them.
Plus it's not uncommon the faucets not allowing the withdrawals (hence scam).

I will add that I don't think that trying to earn from faucets worth the money one would spend on electricity for the device he will use for browsing there