In 2024, a round of PBCoR trampoline effect testing retroactively decertified a batch of paddles. Players woke up holding $200 paddles that were suddenly illegal in tournaments overnight. A related class action settlement reportedly returned about $300 to some players.
That is the consumer scar behind the current grandfather clause in the new spin test rules. Regulators learned, or at least got sued into learning, that you cannot pull the rug on people who bought in good faith.
Why it matters: this is the rec player test applied to regulation. Rules written for the pro game land on regular players' wallets. The grandfathering in the October 1 spin test exists because of this mess. Remember it the next time a certification fight breaks out, because the people with the least power in the room are the ones holding the receipt.