Bird netting is an interesting idea. Related searches led to this: Lacrosse Scoop 20x10 Foot Lacrosse Backstop https://www.amazon.com/dp/B07PRDBPPX

As far as your question, the backyard is fenced and there are things back there that are not child-safe. Seems like a liability nightmare, especially if they were back there unsupervised.

I also generally don't want to be surprised by (semi-)strangers unexpectedly being in my personal space. I don't have a driveway, so where the hoop is is more-or-less public space.