why CLAM is legally fine for JD and BTC not?
CLAM could not be exchanged for USD.
BTC could.
Couldn't really open JD with Bitcoin test net coins cause people would start hustling them and that upsets core devs

This is like the next best step cause anyone who had a BTC/LTC or DOGE wallet in May 2014 already has free CLAMS (come to Just-dice.com and typedig in the troll box.)
You need to "claim" your clams by signing to prove you owned the priv key. I always recommend to should retire that address and never use it again when you use it for CLAM claiming

Better safe than sorry!