Due huge of bots and scammer attack faucets sites
i don't think is only for this, see the old faucer like moonbitcoin, freebitco.in, zebra faucet and other similar, is open from more years and pay regulary. I think more faucet closed because more owner
1. open a faucet with high rewards bue with more antibots
2. open a faucet with high rewards and later 1 week dond to 200 satoshi per claim
3. use a bad advertising