When all these phishing sites are taken down, and as a long term solution
exch should consider buying the major TLD out there to avoid giving scammers an opportunity to clone their business!
That won't stop phishing. Any domain that starts with "exch" can be utilized for scams.
After reading what you wrote, I have realized the reason the other four domains went down was because these (
exch[.]center, exch[.]cc, exch[.]live, exch[.]cash ) were directly involved in the phishing, but for the remaining domains the approach has to change as these are more of the affiliate business front (indirect scamming) and so the registrar will find it difficult to take them down.