Yeah you are right and I also understand your point but however the reason why I feel the threats has been eradicated is that the Royalmix team has been able to develop a domain that will never be the same as any other similar domain that could be purchased by any illicit dealer because the difference is the redirection when you click on the link and it takes you to the main website, so perhaps a user should be able to identify between those domain, well just like you said no matter anything we should be very vigilant.
I don't think you fully understand what RoyalMix has done here, they have purchased ~ 50 similar domain names, and if you click on any of these purchased domain names, it will redirect you to the original mixer website.
However, there are still other similar domain names out there that have not been purchased by RoyalMix. Take note of the cost involved here, so you see it is not possible for them to purchase it all and so the threat has not be eradicated, only reduced, so people should still stay vigilant. Don't trust, verify.