Well, now, tournaments are another matter.

Hmm.

http://scrabbleplayers.org/w/Official_Tournament_Rules

NASPA sanctioned play in Canada and the United States must obey the Official Tournament Rules, edited by the Rules Committee.

http://www.scrabbleplayers.org/rules/rules-20161201.pdf

When playing using the international lexicon, the word reference is the third edition of Collins Official Scrabble Words, commonly referred to as CSW2015.

https://scrabble.collinsdictionary.com/check/

Hmm, yeah, they don’t allow PECKERWOOD.

It sounds like Hasbro used to sponsor the tournaments. Then they stopped funding it, but officially-endorsed a player-organized league, NASPA, the people whose rules are given above. Then in 2021, they stopped any official endorsement.

So with that exclusivity gone, I imagine that someone with sufficient savvy that could sell enough players on the need for PECKERWOOD could form a rival league.