What will happened to those who use the mixer previously. Is there a chance that my Bitcoin will be connected by Bitcoin use from money laundering or we are still safe? I use Chipmixer every week to mix my coins. Its sad to read this bad news. 
I doubt you would get arrested just for using the mixer, this would be plain dumb. Now, if you used the mixer to move coins related to hacks, exploits, ransomware, drugs, etc... and they can link your coins to your identity, then you should be worried.