I don't know what's going on right now with Sinbad but I am not very surprised to see that coming. Mixers should take on consideration the risks of running such service and where to operate it.
Not wanting to deviate too much from the main topic of the OP.
Do you think that a mixing service that only works on clearnet is less exposed to these types of problems?
No I don't think so because for many governments these type of services are equal to money laundering, tax fraud and illegal activities even though they are operating in clearnet. It is hard to convince these politicians, who are by the way doing the same thing with offshore companies, that all mixers aren't the same.
Personally, I find these services as a good way to keep your privacy and your money from being tracked by curious people. Governments think otherwise since they fail to track them.