Ladies: What percentage of guys on dating apps actually open with just "Hey"?

It's a common joke that guys on dating apps don't put in any effort and just send a simple "Hi" or "Hey" as their first message without bothering to come up with something interesting based on the girl's profile. But is this actually true? I'm curious to hear from the women on here. What percentage of the guys you match with just say "Hey", as opposed to looking at your profile and coming up with a unique opener?