"May" and "might" doesn't sound very convincing. No real evidence about calorie free sweeteners, just conjecture.
I am often guilty of enjoying a diet drink with an ice cream cone.
Most of the really skinny people I know don't like sweets.
I used to drink diet soda and consume diet everything. I grew up with packets in the house as a sugar replacement. Almost 20 years ago I cut out all artificial sweeteners from my diet and lost 15 pounds in two weeks. At that time in my life that was the only change in my diet.
Artificial sweeteners mess with your body. I may not have the unassailable scientific proof that they are harmful, but I’ve lived it.