Even there's no official laws and regulations for mixer, but we all know government always fight against of privacy and money laundering matter. It's just a matter of time mixer will be more regulated or they will ban all mixers.
That's possible the government has been employing If You can't fight em join em tactics so they can control, make a profit and regulate, so it's possible that they will impose regulation on these mixers, Cryptocurrency community fight for privacy will go on and mixing business are here to stay so it's possible, or they will keep on chasing these mixers and Crypto holders will keep on looking and using for mixers to anonymize their coins.