It should be mentioned that I operate one of the only remaining Testnet v3 faucets as well. Even with the sudden rush of users, I think we've only had our faucet go dry for a few days at a time. Mostly to take a few days and just attempt to shake off the abusers.
https://altquick.com/faucet/My organization has been giving away Bitcoin Testnet since 2022.
Running a successful long-term faucet takes a good business plan. Just like anything else in the world!