Or, BetFury has decreased their faucet budget

That is actually a joke. I doubt that there are many level 1 gamblers who have tried to abuse the system. It is so easy for security to check logs and connect similar IPs with account logins. If on level 2 you get 42 sat hourly or 1k daily, then how much do they get on level 1 ? Much less. It will take a lot of time to claim enough to pay numerous VPN subscriptions. After all, level 1 have FunFury faucet. They can still try luck in Fury Wheel.
Agreed on this, Their free BTC faucet reward is also just a dust amount and not worthy to be abused by multiple account farmer. Theres no VPN that can gave them such massive unique IP without even noticing by the casino support. Probably Betfury detect some abuse and now they upgrade the requirements as an excuse for limiting the budget.
They can always limit the amount of BTC that can be stored from this faucet to avoid abuse.