When I looked at BSF a few years ago I ruled it out for my area because our climate isn't suitable for outdoor rearing. The received wisdom was the indoor rearing didn't work, because it was impossible to get them to mate reliably.
It looks like this problem has now been cracked, and there is now a startup raising them in London.
Here is an EXCELLENT playlist documentary about BSF on youtube:
BSF Documentary
For those who aren't familiar with them, they are rapid digesters of waste food material, that make lovely protein and fat rich larvae for feeding chickens, fish and reptiles. There is a decent income to be made producing these as a business, as well as a space for them on the small scale for a homestead.