Didn't even know that ecomix existed until today

Reasons for abandonment could have been bad business or the bestmixer domain seizure ripple effect(which to me seems less likely)
Last time were very active on the forum was when they were trying to get their
service tested of which some people even decided to scam them
OP then when offline 25 days later until now. No effort was made to make any new announcements or updates whatsoever.

Probably accepted their fate or could have been that the funds lost during the scam was vital for their operation. In all honesty, I haven't even heard of Ecomix up until now, This is bound to happen for low-volume services that couldn't attract new customers/users to their site: closure. Good thing this wasn't all about the regulation thingy that has been happening very recently that targeted mixers and just another case of a somewhat poorly maintained service that could have gone big had the operators put their heart and dedication into it.