Threats are unfortunately sold everywhere . Smoked bones that splinter a lot, toys for birds that are not stainless steel so can cause heavy metal poisoning, cages that rust, toys with large amounts of coloured threads that birds ingest, pack in their guts and they die from starvation...etc etc etc lots of stuff.
Look at toys for kids on the market at times too, sometimes recalled.
In my opinion so much can be a threat to the non discerning or those who have no idea how to properly use collars, walking aids etc. I would be one of them too unless I had to use them then I would make sure I found out how to do it properly. Many though, I think would just have a go in the way they think it might work.