I would judge free granny dating on whether 'free' means free to browse or free to talk rather than on the feature list.
I logged into that one at different times of day to get a read on how much is automated versus reviewed.
Provided whether 'free' means free to browse or free to talk holds up, the service is a reasonable place to start.
My rule for the service now is simple: check how present the moderators actually are on day one.
Someone in another thread pointed me at Rendate's free tier and it was a fair shout.