Most of my friends who bowl are on my team so it isn't an issue. Any others I would try to help.
One issue is the guy coming on a board like this and asking how to play the lanes. Now for the most part if they are asking on a bulletin board they probably are not a big threat, particularly since they don't know my game. But still why would I help them take money from me?
The other is the random guy in the house who knows my game and that I bowled in a tournament with some success but is not a friend. Again I might give general information at best.