I doubt they provide any kind of guarantee that they'll catch everything. That's not what a tool like this is used for (i.e. it's not a security tool or a network monitoring service).
OSINT is about gathering data from public or semi-public places.
There are plenty of private dark web forums that these kinds of tools probably don't have visibility into, but the bigger public well-known ones are where you are most likely to see high-profile breaches being sold (since there's a wider audience and actors want to sell data quickly before it devalues), so it's certainly better than nothing...
I never asked for a guarantee, that's not feasible, I was looking to see if in-house analysts or engineers can review the data they're using or lower confidence results as a second set of eyes.
Thanks for clarifying - honestly, we're a tiny startup so not really here to play PR games, just didn't fully understand the question. Users can 100% review all the results even if they aren't ranked as 'high priority'. You can even free form search our repositories with boolean strings like you would any other OSINT tool, but with the added benefit of an AI agent to help triage, if you so wish.