It's not like they spam/share their faucet rotators outside Micro-Earnings section.
IMHO, referral links (if allowed) would be mostly shared in the micro earnings section too, as well as signatures; but faucet rotator owners put their links in their signatures as well so it's pretty much the same there.
From what i see/know, those links in signature that you mentioned is just simple URL with desription.
I bet most people don't watch their signature because they focus on attractive/very big signatures
Make a faucet rotators needs time and money, so just let them earn small amount of money.
Wrong and wrong. There are a lot of faucet rotator scripts out there that someone who doesn't know how to code to save their life can use to make a rotator. Also, money? Where does money come into play? Domains aren't required (or sometimes they use a domain they got for free, like the .XYZ giveaways), and there are always free hosters out there.
At least they still need times to make their own rotators.
