I keep seeing vague answers on other forums so figured I'd ask people who actually know.
The free tiers on most of what I've tried are basically useless. You get just enough to see that real people are there, then hit a wall the second you try to actually message anyone.
I've noticed a huge difference between platforms that moderate actively and those that don't. The ones that don't tend to become unusable within a few months.
Feel free to share whatever has worked for you, even if it's not the obvious answer.