A new mixer of course is always welcome, but the problem here is that if the operator isn't experienced enough, significant gaps in security and IT knowledge may cost their users serious problems later, since it usually takes one mistake to have the whole operation compromised when your enemy is state. Note that ability to code a mixer doesn't mean ability to secure operations properly.
After reading everything here, I gotta say I'm on the same page about this. One obvious example was using fonts and stuff from third-party sites. Like, who needs fancy fonts on a bitcoin mixer? Even newbie coders know that crap can be used to track people. If they're making such basic screw-ups, I dunno how much I trust PureMixer to really know what they're doing running this kinda biz. Im no security expert that's just my take, but it's enough to make me skeptical.
They say it's untraceable but that seems kinda suspect if they cant even figure out simple opsec stuff and maybe the tech is solid but they just suck at web dev, idk. Still though, makes me nervous to use them. You'd think they could hire someone who understands privacy basics.