There is no betting sanctioned by World Athletics, so get that out of your head. if betting occurs it is unsanctioned and setup by betting agencies legally (or illegally) operating in a jurisdiction with no guarantees to the patrons regarding adherence to rules or oversight.
Betting does not guide athletics and never should. pivot to "sportsmanship" guiding it and it's just as hokey. this was an open race and anyone has the ability to win or lose on their own accord. Just because it looks bad on camera against your personal moral compass doesn't mean they can't do it.
They were paid to assist this dude and not win the race. it doesnt matter by who. that wasn't against the rules, and the organizers just made up their disqualification to save some sort of public/sponsor embarrassment face, which is more embarrassing.
Cut through all the bullsh1t here and put an extreme hypothetical grey area example on the table:
-Josh Kerr pays an "employee" to be his training partner.
-That contract stipulates that the employee's compensation benefits depending on Kerr's success. that is, the employee makes more money the more successful Kerr is.
-Jakob Ingebrigtsen wakes up one day and decides to apply to be Kerr's training partner employee.
-In the final stretch of the olympic 1500m final, if Jakob let's up and allows Kerr to win because it's more financially lucrative for him, has either of them cheated? has either of them broken a rule? can anyone even attempting to argue that something is wrong prove that Jakob has done anything willfully, when the nature of human physiology is such that he can just say he ran out of gas.
I see a lot of posts on here about disqualification for lack of best effort in high-school and collegiate races. that is so far beyond stupid I can't even comprehend it. People have the right to chose to lose. if that upsets you, you might be a control freak.