Sinbad.io probably does not have too much time before various law enforcement agencies get together to organise the shutdown of their website and try to arrest the owner/operator on money laundering charges. If criminal activity as taken place on an industrial scale and almost zero protocols were put in place to either reduce, minimise or eliminate the risk of illegal activity by the owner/operator they will end up facing serious criminal charges.
This is one of the concerns bitcoiners have had so far - and of course I think it's normal and makes sense.
The government will try to put up more of a fight for any mixer and it's definitely on their watch list. Of course their main reason is to prevent a lot of money laundering cases - but actually they seem to have another mission besides fighting crypto, confiscate bitcoin for example.
The same will probably be attributed to some of the other mixers currently growing and developing, but of course it's a matter of time. Until then, I think the government will shut down any mixer service like they have done other mixers before.