I don't understand why but people do it, people do crazy things use a lot of IP, scripts, change addresses to prevent blocking to get more and more testnet coins
This is one of many examples:
https://tbtc.bitaps.com/2NBMEXavJZV2VoBCiRFHEJ8DehgYnfM9wav8.34076971 tBTC 1 736 transactions.
We created a testnet faucet to help developers and did not expect to encounter inexplicable greed of people.