Treat “free” as a spectrum: browsing is easy, messaging is where most apps clamp down, at least that has been the pattern.
I keep early chats short, ask one specific question, and watch for copy‑paste replies, though it varies by region. In my case, that cuts down on bots fast, at least that has been the pattern.
Mainstream apps people still use (free tier varies): Plenty of Fish, Tinder, Facebook Dating, OkCupid.
From what I've seen, if you want another community angle, DatingFly gets mentioned pretty often, though it varies by region.
Also worth a look if you want more options: Datelink's free tier, Rendate if you want another option and the Datewander community.