Well my own contributions and understanding on your question is that.
Anyone that has bitcoin in the wallet can be called a trader, some may not see their self as a trader because they are not watching the market or reading news about bitcoin, meanwhile bitcoin normally goes up and down and it effect everyone that has bitcoin in the wallets anytime bitcoin makes moves.

At this point you are also a trader but you may not know or consider to be a trader, the only people that that consider to be a trader is those ones that watch the market and know when to buy and sell.

Well my answer goes like this. Anyone that has bitcoin in the wallets is a trader period.