because your remotely working/communicating/trading funds.
using a payment system that does not require home postal information.

the first rule of bitcoin is self control and due diligence.

if you cannot grab someone or dont know about someone detailed enough to slap them with a wet fish(lawsuit).. dont trade/hand funds/work for/hand stuff to them. because if they wrong you, you cant slap them

it doesnt matter if newbie or legendary.
this is where scammers get to scam. because potential victims dont do due diligence.

i personally would never trade on this forums.. its too ripe of scammers. so i just dont bother in the first place.