As a sample size of 1, and a person who has used a lot of different substances (alcohol, cigarettes, amphetamines, psychedelics, marijuana flowers and extracts), been addicted to quite a few of them, and kicked all of them, Kratom has been by far the hardest drug to stop. After reading online about the potential benefits and mildness of Kratom, I started taking it occasionally, and slowly had to ramp up usage frequency because I would start feeling cold and uneasy when not on it, I pretty soon I had to take it consistently to stay at my baseline level.
I managed to taper off down to a manageable level (about half a coffee spoon every 5 hours), but going beyond that was impossible without feeling the withdrawal effect pretty much full force, I decided it was best to bite the bullet and stop cold turkey.
Extremely cold feeling coming from inside on a very hot day, awful restlessness (which made it impossible to sleep more than 2 or 3 hours a night for the first week, before I had to give up and go on sick leave), the most intense feeling of being devoid of energy both physically and psychologically, and pretty much all the symptoms of a strong cold. The extreme sleepiness and impossibility to fall asleep because of the restlessness is one of the most frustrating combos I've ever experienced, but I'm sure that's all too familiar to opioids users.
If you're trying to kick off an existing opioid addiction (or maybe have some sort of pain where the usual pain meds channel are not available?), this might make it more manageable I'm sure, but all the analogies to coffee or tea as "Just a thing you can take if you wanna calm down a bit" can be extremely dangerous to people that have essentially no need for it, and particularly people with an addictive behavior.