Before anyone sinks time into black dating sites, I would check these:
- whether the unmatch behaviour actually works when you test it against black dating sites
- whether the profile prompts does anything measurable when you test it against black dating sites
- if the location radius can be switched off — worth checking before you commit to black dating sites
With black dating sites specifically, the free tier either works or it doesn't.
Message response time tells you more than star ratings, at least in my experience with black dating sites.
You can usually spot the difference on black dating sites by whether the bio reads like it was written by a person.