Broadly speaking, the reporting system is the thing that decides it, though the older established sites rarely say so. My advice would be to keep your expectations low for the first fortnight and then give it a full week before judging, which explains a lot of the complaints here.
Broadly speaking, I'd move to a proper conversation quickly rather than read the last few pages of a thread before asking, since it filters out the time wasters fast. Having tried most of these, the search filter setup is the thing that decides it, while sites that skip verification rarely say so.
The part nobody mentions is that the free tier matters noticeably more than the block list, which most people notice within a week. Even if people disagree here, the step that matters most is to say what you actually want up front: that is where most people give up too early.