Couldn't fully read the article though.
If betting wasn't allowed it would be significant income loss for sports teams as well. Maybe you might think that they don't need that much money, but that is subjective.
Negatives aside if you are fine with the losses it could be viewed a bit like donating to the football clubs.
Larger football clubs could be fine taking pay cuts etc, but there would likely be many smaller clubs that can't pay their players on the pro or semi pro level any longer.