Even though those 100 users who review their service did not continue to use it afterwards but everyone of them (expect a few) review their service top notch and excellent
If the Mixin Safe Service was not trustable, had flaws then why people did not highlight in the review ? I must say it is a wrong behavior for most of the reviewers to review "Good" only (Maybe they got the money from the company so its hard to say bad words about them)
I didn't personally take part in the review campaign, but I did read some of those reviews from several reputable members. I didn't find anything particularly bad about them, and most review campaigns tend to be that way.
You should understand that these reviews are coming from regular users, not security wizards doing expert-level audits. They usually focus on the user experience, how things feel, and not so much on digging out potential flaws or security loopholes that hackers could exploit. I mean, let's use some common sense here. If the company itself wasn't aware of the security flaw that ultimately led to the hack, how in the world could the end users have possibly known about it?
And who's saying that Mixin wasn't trustworthy? I'm not defending, but as far as we know, they got hacked; it's not like they made off with their users' funds in some sort of scam. Besides, the review campaign focused on a specific service the company provides, Mixin Safe. However, as far as I can tell, it's just one of the newer additions within the broader Mixin ecosystem. We don't know that this specific segment has been compromised in the hack.