Except for services subject to RCW 50.44.010, 50.44.020, 50.44.030, or 50.50.010, the term "employment" shall not include services performed by amateur sports officials, on a contest-by-contest basis, for interscholastic and youth or adult recreational sports contests. For purposes of this section, "amateur sports official" means any person who serves as a neutral participant in any sports contest where the players are not compensated , including but not limited to, an umpire, referee, judge, linesperson, scorekeeper, timekeeper, or organizer, and who is not otherwise employed by the sponsor of the sports contest.