All casinos aim of course is to earn money so that's really not a question anymore. It is up to the gambler if he will play or not, and with their low HE, this feature might be their attractive feature to gain players. Faucet though is one thing to attract new players that wanted to try their site first before depositing their money.
Although either 1% or more lower than that still theirs a risk but what is more important here is if the site is legit running with trusted backgrounds then for sure we will not worry about anything regardless on what is the edge of the site, But I will like it literally if they will implement a low house edge since for sure this is a good marketing strat for them and many gamblers will come due to that implementation