That's incredible! No one would ever spray their PayPal address, Venmo or ACH details. The next logical step is to create a medic bot automates the process ;)

What does "pocket medic" mean in the TF2 context?

It means a player playing the medic class will prefer healing you to other players, and will stick around your position, i.e. stay in your pocket, hence 'pocketing.'

Means you as the medic character stick to healing that one person, becoming their "pocket medic." Commonly people pocket medic heavys, the biggest characters who have a large spray weapon and high max HP.

I guess he'll pick a medic class and will heal you constantly for a small compensation in bitcoins.

This is amazing.

Only the match is over before the transaction clears

That picture is two years old and custom decals are no longer possible.