Is oat milk a good substitute for vegetarian?

I recently came across this article about Oatly, thoughts?

I recently encountered an article that discusses the high glycemic index (G.I.) of maltose and highlights the potential negative impacts of canola oil present in oat milk.

I really like Oatly as a brand, however I am no expert in food science or marketing, so if someone could help me understand it, it would be really appreciated.

#AskLemon8