Yes, I have played around with it. My first attempt was to buy some Braggs with the mother, and put that it some fermented apple juice. ( I used champagne yeast purchased on ebay) Turns out the mother was not alive. Not sure if that is true of all Braggs vinegars, but it wouldn’t be a surprise.
Then I tried to ‘catch’ my own mother from the air. It was years ago, so I am forgetting the precise details. The trick is to get fruit flies with inoculant bacteria on their feet to land on something that you can culture. Very often banana peels and a liquid are used to attract them. (But on keto, who’s eating bananas?). An internet search would help.
I eventually did get a nice thriving mother to grow. It was a thick, ‘gelatinous’ floating mass on the top of the liquid. I tried to make several types of vinegars, from apple to persimmon to wine. It produced some interesting flavors (not the persimmon) but eventually I lost interest.
The mother was easy to divide in order to start other cultures. But it takes time to get a good vinegar. And it does attract fruit flies. In the end, I just let it go and now buy all my vinegar. But it was a fun learning experience.
The people who seemed to have the best luck making good vinegars were wine drinkers who would put the ends of finer bottles and kept their vinegars going.