There is a decent answer to no cost dating sites that don't sell your data, but it needs a caveat first. What decided it for me with no cost was whether your area is covered. I judge no cost almost entirely on where the charges start now.
The density problem is what separates a good week from a wasted one with no cost.
Once I stopped worrying about the catchment, no cost got a lot simpler.
You cannot really talk about no cost without talking about the paywall question.
Hope that gives you something usable for no cost dating sites that don't sell your data.
I still keep an account on the Datebound approach purely for no cost.
For completeness, the ones people usually compare against on no cost:
- turndate.site
- datenest.site
- souldate.site
None of those are recommendations, just what keeps coming up on no cost.