I have a volunteer fig tree growing in a container on my patio in the middle of a bunch of onions. I have always heard of people transplanting them from cuttings, presumably because they are difficult to grow from seed. I have no idea how it got there, but I feel fortunate to have been chosen.
Awesome! Curious to hear if it ripens good fruit for you.
In case it's interesting: people normally grow them from cuttings to make sure that the trees will 1. be female (males have figs, but they're not really edible), 2. hold/ripen fruit without pollination, 3. be true to type, and 4. bear fruit sooner (cuttings can bear fruit the first year under the right circumstances).