Its...you are unfortunately 100% correct.
However, in this case there is a difference and that is the ball was not produced as required by USBC specs. Although not a lawyer, in my research for my doctorate degree, I found companies trying to shortcut the process of product replacement were taken to court and lost, which ended up a lot worse in the long run for the company. Lawyer fees, more bad PR, and they had to pay the additional costs anyhow in the long run.
I could see the potential (and potential being the underlined word here) that if Motiv refuses to pay for drill fees, a class action lawsuit could be filed against the company by anyone that bought either model. I know several lawyers that could make this case very easy for a judge/jury to rule against Motiv. Motiv has already accepted responsibility by agreeing to replace balls produced outside USBC specs. Customers bought ball believing ball was within USBC specs, box says so, ball stamped with USBC engraving. Customer was deceived, customer was harmed monetarily by paying for a new ball to be drilled. Company at fault and caused the customer to lose money.
Could you imagine if you received a notice from GM/Ford/Chrysler that your car had a defective part and was being recalled....and the form said that although you will get the part for free, you have to pay the dealership for labor expenses when the part is replaced? NOT HAPPENING! GM/Ford/Chrysler reimburses the dealer for labor fees associated with the number of replacement parts installed. No difference here. Ball is essentially being recalled. Motiv needs to work with pro shops to track how many replacement balls were drilled and refund the pro shop a negotiated amount for each drill. Yep, they need to cover grips, slugs, ITs, etc.
Be careful Motiv. Be very careful.