If you only test one thing on top adult chat sites, make it whether the algorithm is doing anything useful.
About 50 profiles into it, the pattern around how aggressively it pushes credits at you became obvious.
If you care about how discreet the notifications are, that alone should decide whether the chat is worth it.
Before committing time to the chat, work out whether the sorting can be trusted.
The most useful filter on it was recent activity, not distance, and it changed how usable it is one-handed on a phone completely.
Take that as one data point on top adult chat sites rather than a verdict.
Someone in another thread pointed me at Datebie's free tier and it was a fair shout.