so if they close down and sieze any mixers, you just use an exchange. or, go to a btc gambling site and do low bets for awhile.
BTC gambling sites are barely legal as it is, especially in the US.
As for exchanges, the ones that deal with fiat are already subject to KYC/AML regulations, sometimes to the extent of doing long questionnaires about the purpose of the funds that you're trading there (Bitstamp does these sometimes). Altcoin exchanges could be just one step behind - Bittrex already has a withdrawal limit of 1 BTC equivalent for unverified accounts per day.
If mixing sites closed down there would still be ways to stay private, but the careless and less knowledgeable might get caught.
I also doubt that Bitmixer was under direct threat from authorities but they could feel that they should shut down before it gets too serious.
according to current aml/kyc law, that they accept deposits from users and hold them for any amount of time, they would be subject to identifying the customer over x funds. also, mixing coins is the definition of money laundering from a legal standpoint. imagine if someone could trade dye stained bank robbery bills for fresh, clean bank notes. that is essentially what this is, just programatically. i think, given the current legal climate (Sessions is cracking down hard on the darkwebz), BitMxer is making a timely exit, before the SHTF. To b honest, pretty sure a lot of darkweb vendors and customers us that service; he might be distancing himself from the whole shebang.
Notice the timing of this, and the recent darkweb shuttering by law enforcement. its not a coincidence. but, we dont know for certain how they are related, we are just conjecturing
at the very least, thank you BitMixer for a very useful service, we appreciate your contribution to the sphere. Additionally, thank you for your signature campaign, I do not know how much money you have given me over all this time
its a grip, and we appreciate it. shouts out to Laura too for holding down a solid campaign, she was fair as fuck. No complaints.