The free tier changed a little since the start of the year, so results vary more than you'd think. When the replies dry up after one message, the ones with a paywall tend to feel considerably worse than they are, but only if you stick with it.
Broadly speaking, the block list is the thing that decides it, despite the fact that the bigger platforms rarely say so. These past few weeks most of the free apps have started throttling messages, so results vary more than you'd think.
The read receipt setting and the block list pull in opposite directions, which is worth knowing before you sign up.
Coming at it from another angle, datewander gets mentioned a lot for anyone starting from scratch, at least in my case.