Maybe some of those faucets are getting bankrupt so they were getting dry as you are saying but i think most of them are reducing their reward because of the halving if they dont do that their faucet will gets bankrupt too so it is necessary for them to do that . We dont have to complain about it
Maybe the bankrupt because the adds on their faucets is not work anymore, so they stop the faucets and also the price of bitcoin is incease so high right now, it's make the rates for faucets become so low.