Not even police can help you with this. It's way too gray legally if they even broke the law. Technically they delivered a product and just quietly faded away, probably because lack of funds. Even if they malice intentions all along, it would be hard to prove they had planned this from beginnig.
Well if people are motivated enough they can surely seek legal council where they live and see what can be done. Hopefully some will. It is infuritaing how easily scams in crypto are still being operated and how scammers can get away with it
.Plus they just removed the opening post which is very suspicious to say the least.