Actually I'm going to go on a rant about sustainability right now
The demonizing of bones is one our great downfalls in society
Bones are so freaking useful
You can make needles, flutes, combs, hair pins, buttons, jewelry, and glue
But we demonized that, and it's not like a religious thing either
Or at least the initial demonization wasn't
Up until really modern times bones were just things you can use
In fact they were considered a nice material to use
Like whale bones were used for corsets, hence boning (obviously we don't want to keep hunting whales but we could scavenge the bones)
Everything we can use bones for has mainly been replaced by plastic
Plastic breaks easier and leaches micro plastics and other toxins 
If your bone hair comb breaks it can just get tossed without harming the environment
I forgot they used to also make these bone brushes for softening and conditioning leather and those would get passed down from generation because they lasted so long and they just work better than any plastic can