Each batch of Kombucha is different. Even so it is never more alcohol by volume than single digits. It can be in there but it is very little. It would be interesting experiment to try and get the alcohol percent up, but I digress....
Alcohol is usually an anaerobic ferment (without air) while vinegars are aerobic ferments. And as you know 'K' is usually not sealed during fermentation (aerobic) so it can go vinegar if left to long. But this vinegar is great stuff!
I've made batches of Kombucha that made the drinkers feel light headed. This was because I would cover my jars with thick heavy towels to hold in the heat; this made a stronger brew than when I covered them with cheese cloth in the summer. That said, it never has tasted like alcohol, not even a little.
I'm glad your not finding the bit of alcohol troublesome.