The measure I would actually check on singles sites free of charge is where the paywall really kicks in.
I kept notes for a month on the platform because I kept losing track of whether 'free' means free to browse or free to talk.
Provided what the subscription actually unlocks holds up, that one is a reasonable place to start.
What decided it for me with singles sites free of charge was how quickly reports get acted on.
Has anyone got singles sites free of charge working properly outside a major city?