Then why do you need to tolerate it better?
There’s something missing in this ask. If you don’t handle a food very well, you simply avoid/reduce it. Whether it’s caffeine, an allergy, or whatever.
Why do you need to change your body’s reaction? Why not just switch to decaf or other drinks?
They are allowed to run, because there’s no law stopping them.
As for why they have a chance at winning, I don’t think I can answer that without significant bias.