Decided to just come out and ask since the search results aren't giving me much.
The account verification process tells you everything. Platforms that do nothing to verify are the ones you'll regret spending time on.
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.
Any input is appreciated, whether it's positive or a warning. Both are useful at this point.