I've done my own digging on good free casual encounters sites left and come up short. Look closely at left sites and the practical move is to cancel the trial the day you start it. The deciding factor is how fast moderation responds, for what it is worth, which is the whole problem with encounters.
Applied to left sites, it is worth checking the signal-to-noise in search before you look at whatever the landing page promises. The encounters sites angle is worse, because the churn on new sign-ups is the number worth watching, not the length of the feature list. I judge encounters sites on one thing: the platform makes verification optional and then hides who has done it, and that is usually where the goodwill runs out.
Encounters sites is where I'd start, since the churn on new sign-ups collapses as soon as the platform auto-renews without a clear warning. Good free casual encounters sites left looks simple until you notice that the platform boosts newer accounts over established ones, so it pays to compare two platforms in the same fortnight. Happy to be told I'm asking the wrong question about encounters.