RPF(T) do not recommend using the Zero or ZeroW in commercial product due to the production limitations. We have the CM or indeed the Pi3 and Pi3A that have no such restrictions.
We are looking into ways on increasing production to suit industrial requirements, but this is a way away, and may not suit everyone.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
Contrary to popular belief, humorous signatures are allowed. Here's an example...
"My grief counseller just died, luckily, he was so good, I didn't care."