How about Samourai wallet Whirlpool? Both Samourai wallet and its Whirlpool has been taken down also just like Chipmixer and Sinbad. But it is better than sending a coin to a more centralized service like Whirlpool which is completely an exist scam. Whirlwind was not taken down by the government or regulators unlike Chipmixer and Sinbad.

All known mixers are not completely decentralized. They are centralized as they run a server. A decentralized mixer needs not to run a server but depend on several nodes across the word which will be difficult to be taken down by the government.