Dating sites sites
Because who doesn't enjoy sending a thoughtful message to someone who might never see it?
You can still send a message -- it just won't show up in the recipient's inbox unless you match.
I shouldn't have to look up online tutorials to figure out how to use a dating app. I was also disappointed in the notifications, which I found too pushy.
CMB was constantly "gently" reminding me to message users I'd matched with.
The downside is that short profiles make it harder to figure out what people are looking for.
Knowing very little about a person can also make initial messaging more challenging.