How does Snare! work in Netrunner?
Normally the Corp doesn't get to see what cards the runner accesses from R&amp;D. This would mean the corp wouldn't know they could spend 4C to deal the damage! When accessed from HQ or a remote server, the Corp already knows what the card is, and so can pay 4C to deal the damage.

By making the runner reveal the card when accessed from R&amp;D, the corp gets a chance to choose to use the ability on Snare!

The effect triggers when accessed from anywhere other than archives.