I'm on-board with the moral aspect of minimizing support for the dairy industry (though this topic is oddly never brought up), however, I just don't like the taste of Oatly's products. They are indeed too sweet. There are better-tasting oat beverage brands out there which declare less sugar (and without salt for balance). Soy milk works great, too.
I like the creaminess of Oatly - works well in coffee.
Other brands I tried (Alpro) were a bit watery and some use guam, which is an OK thickener ingredient, but doesn't go with milk alternatives in my view.
Maybe I'll look into making Oat milk - seems like a quick and easy thing to do.
The Swedish producer Trensums Food makes great oat drink varieties that I know are sold under different brands across Europe. I'm unfortunately only familiar with one of the Swedish brands, Coop.