It's not about safeness, it's about taste, cheapness, metabolism and gut. A protein is by far better than a synthetic one on all accounts (apparently).
Even WHO makes such claims: https://edition.cnn.com/2023/05/15/health/who-sweeteners-wei...
No one here is making the claim that it should be used for weight loss, that's more of a carbs issue in general - to which we have no substitute yet.
So yeah that is what's everyone is claiming.
It might not taste exactly like it, but nothing will. Regardless. Zero alternatives have become a massive market, and im sure many prefer it after while, knowing how human taste develops.