During the take off run, and just on the ground before to get airborne, usually, the aircraft is affected by "positive weathercock effect", or, in other words, yaw into the wind due to the main wheels that, being close to the CG, act as a pivot allowing this effect. When I say usually, I mean that we have also "negative weathercock effect", which yaws the plane away from it, allowing exactly the opposite effect. Once airborne, the aicraft won't experience any weathercock effect, so any "yaw" due to crosswind, but just Drift, pushing the plane in the opposite way the direction of the wind! Furthermore, the wind doesn't impact just the fin but mainly the fuselage, creating in an upwind engine failure case a restoring force, thus helping the aircraft to deal with it with the rudder!