yes for me its mostly a security feature .
Becourse i cant check logs daily somethis few days pass away until i can check for fraud...... so currently many bots claimed on my faucet and most of bot users had about 3-5 k in balance when i found them ....... so if i would payed them direct i had loosed many coins on this situation..... many thinks like this happend in more than 4 years now and the threshold brings me more time to check fraud activites .....

but i have to say iam now logn time in faucet buissnes and i saw many faucets come and go in short time and  nealy no instant faucet become old...

regards