Indeed the WHO advised against sweeteners just a couple weeks back: https://www.who.int/news/item/15-05-2023-who-advises-not-to-...
If you're already in the middle of the healthy BMI range and not having trouble keeping a healthy weight, I don't think there's been a demonstrated harm.
It’s worse for people attempting to lose weight because it apparently doesn’t work for that either, and this is the main reason sweeteners are used.