system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why is it legal to bet on horse races, but illegal to bet on sports?

Watching clips of the Kentucky Derby - they show, and even promote, betting and odds on the horses.  Why/how is this acceptable and different than other sports, where I hear about people being fined for betting?  Is it horses vs humans, or something more complicated?  Thanks!

**edit:** Okay, so I guess there isn't actually a simple answer.  I'm speaking in terms of the U.S, I understand that other countries have unique laws on the matter - hell, each STATE here has a unique view on the matter, from the sound of it.  I appreciate you all taking the time to *try* and give a simple explanation to a complex situation.  I appreciate the effort.  *I'm still confused.*
gpt
Here in the UK you can almost bet on anything, be it sports, racing, politics, or whatever. Most every street in any city that has shops in will have one where you can go in and place a bet (providing you are over 18)