> Their financial incentive is negative. They were hoping to force...

Maybe?

People stuck with Bose bricks might show a preference for non-Bose replacements.

People who thought Bose speakers would stay useful longer might prefer Bose, or be willing to pay for a more expensive Bose speaker model.

(Yes, I agree that some PHB's at Bose were almost certainly imagining that their customers would be forced to re-purchase Bose speakers. I'm questioning the validity of their initial assumptions.)

From talking to friends and family, so n=10-ish, non-computer people have not realized that sticking computers in things means they die on computer lifetimes, not appliance lifetimes. No more switches that last for the life of the house; no more speakers that your kids can do modest maintenance to and keep using.

And, if I, a non-Bose customer, hear that Bose open sourced a previous version of their speaker, which gives me some confidence that a present purchase might be somewhat future-proofed, then I am more likely to buy a new Bose product vs a competitor who does not provide sources.