Interestingly, I don't like most oat milks because they're so sweet.
I also learned that while they almost always say they're unsweetened, that's kinda... not wrong, but misleading, as most oat milks use a production process that creates sugar.
There are no-sugar or almost-no-sugar oat milks that don't do this, but they're rare.
Rare? Recently I, again, bought one of those by accident. At least in Germany and the Netherlands, it's available in most stores that also carry the sweetened ones and I find it easy to overlook the word ungesüßt/ongezoet on an otherwise identical package.
I also learned that while they almost always say they're unsweetened, that's kinda... not wrong, but misleading, as most oat milks use a production process that creates sugar.
There are no-sugar or almost-no-sugar oat milks that don't do this, but they're rare.