Oh yeah, on some apps, there definitely seems to be profiles that are liking everybody. I've heard it speculated (not sure if confirmed) that they tend to give you a visibility boost when you are a new profile, which is why you can end up with a few likes in the beginning then nothing. Though with Hinge, I found I wouldn't necessarily get any even when new, possibly because Likes are more limited per day than some apps and it allows you to send a message with a like, so it's a bit more conscious.