There are no requirement for people to make deposits for them not to be flagged as a faucet abuser. TheQuin just mentioned that the specific abuser tried to hide his actions by doing a quick deposit to try and fool the admin into believing that they were a actual legitimate user of the site.
You can make small deposits, but your actions and the way you handle your account would flag certain commonly used behavior that most bots and faucet abusers use to abuse the site.
The abuse is not the not-depositing money, the abuse is the automatic faucet usage. Hell I am quite certain if you did automatic script that claims faucet for you just for your one account even that wouldn't have been a huge problem.You can make small deposits, but your actions and the way you handle your account would flag certain commonly used behavior that most bots and faucet abusers use to abuse the site.
However, if you open 100 accounts and use VPN and then even affiliate yourself and just claim faucet all day every day constantly then you will eventually get banned because the illegal part here is not the usage of faucets with script as you can see, it is the 100 accounts with VPN. How could anyone even think that having multiple accounts trying to abuse the website could be somehow forgiven by just depositing money? You could literally withdraw it back with the winnings. Remember, you do not earn this money, you are given it for free.