Also because women must message first, Bumble tends to weed out the slightly more insecure males.
However the rate of overly confident males tends to be higher than I've seen on other apps.
Because who doesn't enjoy sending a thoughtful message to someone who might never see it?
On the upside, the profiles are brief, which helps you to make decisions quickly.
The downside is that short profiles make it harder to figure out what a lot of people are looking for.
Profiles are a lot more in-depth than most online dating sites, and if you answer a seemingly endless series of questions (much like a personality test), they will spit out a reasonable Match/Enemy percentage ratio on profiles to help you gauge compatibility based on interests.
Changes in the last few years have made Ok Cupid a bit more like Tinder (both owned by the same company) focusing more on swiping and eliminating the ability to message a user without matching with them first.