There have been alot of talks about testnet3, after it been running for almost 11 years bitcoin core can not reset it. It become too decentralize.
Some people forked testnet3 and made testnet4 with higher blocks space, due testnet3 having value and can not be resets !
Now we have 11 years old chain we dont know what to do with it, and nobody can stop it !
Mining Costs Over $130 per tBTC3 (testnet3) has being going up and volume on DEX started to go up