If you want to make a roleplay group, in which people roleplay—online—as spies, assassins, vigilantes, or whatever, then by all means, go right ahead. Roleplaying is fine. But there's a line that needs to be drawn here between fantasy and reality.
And if you wanna get into Parkour, by all means, go right ahead. Parkour is great. It's fun and it keeps you in shape/disciplined. But it's just like any martial art; it can be used for good purposes, but also for bad ones. Eavesdropping on random strangers would be a bad use of Parkour.
I'll stop here. What you do at this point is up to you, nix. Just don't get yourself hurt/in trouble.