I think a bhp or woma would love it if it was deep. I've never tried it with snakes (works with tarantulas and scorps).
They may ingest a lot with their food. Not sure on health issues. But definitely don't get the peat with fertiliser added.
What snake?
Fine for GTP/GTS, perhaps some carpet locals and most elapids, although harder to clean and generally only used in displays or for high-humidity required animals.
Like I said in another thread or two I use Coco/Coir-Peat for all my Herps/Scorps without an issue. Even when they ingest some on occassion it hasn't seemed to do them any harm.