I've done a fair amount of searching and can't find a straight answer anywhere.
Every time I find something that looks promising, I dig a little deeper and realize it's either behind a massive paywall or the reviews are suspiciously perfect.
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.
Would really appreciate any honest takes from people who've actually tried different options.