I actually have an avo tree taller than me that I started this way 10 or so years ago. It is in a pot, and our climate is a bit cold for them, so I move it into the house in winter.
These are normally outside, just hiding from the worst of the winter.
Cross breeding yes - but you usually have edible peppers from the crosses.
Crabapples are what you get when you plant apple seeds. Nearly inedible when compared to the fruit it came from.