The tape you see a lot of Rugby players wearing, singularly wrapped without going further up the hand/thumb for support, is normally just added as a preventative measure following a previous wrist strain. Once strained, the wrist area can be prone to being strained again, particularly under the high stress/impact it is put under in rugby.
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Some rugby players wear tape around their ears because they are scared after one incident where a player's ear was ripped open and lost. wearing tape prevents bruising and damage to ear tissue( cauliflower ear)
The main reason of why Major League Baseball players tape their wrists is so that they can protect it from any sudden injuries by twisting their wrists and some players may do it because of the fact that they have a wrist injury or their wrists are hurting so they tape them in order to prevent their wrists from making too much movement.
Causes less injury to them. If they snap their wrists, then tape will help break the fall a little bit more.