If we would really put an effort, it should be possible to stop them, site is still working and getting new "customers"?

The company says it's British:

Registrant Name: GABRIEL KLEIMAN
Registrant Organization: BTC CLOUD SERVICES LTD
Registrant Street: 46-48 EAST SMITHFIELD
Registrant Street: TOWER BRIDGE BUSINESS CENTRE SUITE 313
Registrant City: LONDON
Registrant State/Province: LONDON
Registrant Postal Code: E1W 1AW
Registrant Country: GB
Registrant Phone: +44.1163262646

UK +44 116 326 COIN
US +1 (855) 782-COIN

We are incorporated in the United Kingdom

Name & Registered Office:
BTC CLOUD SERVICES LTD
46-48 EAST SMITHFIELD
TOWER BRIDGE BUSINESS CENTRE SUITE 313
LONDON
ENGLAND
E1W 1AW

Company No. 08935510
Status: Active
Date of Incorporation 12/03/2014
Country of Origin: United Kingdom
Company Type: Private Limited Company
Source: http://companieshouse.gov.uk/

So it would be good to find some people from London - then it might be easier to even inform the police there...

And collect the scammed users in this forum here.

Maybe we could also complain about the website:

https://whois.domaintools.com/bitcoincloudservices.com

Whois Record for BitCoinCloudServices.com
Email    abuse@enom.com
Registrar    ENOM, INC.