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I use that forum every day, and it hasn’t had any major security problems for the 15 years or so it has been used. I’m not seeing what you’re talking about.

Does the average user likes Discourse? My anecdotal experience hosting a Discourse forum for non-techies is certainly not indicative of that.

I think this is one of the greatest fallacies in modern data science. We only know what we can measure. There's no data on the opportunity cost of design decisions.

In other words Discourse only has metrics on people who use Discourse.

I think this is probably why sign-up metrics are so common but those are perverse as well. How much do you set yourself back if you only work for people willing to sign up?

What kind of security problems are you talking about?