Not through any good planning or product research, but I have two audio devices that don't exhibit the gamut of annoying and stupid behaviour that's made the very word Bluetooth a source of vicious mirth in my household.
One of the devices is a dirt cheap class D amplifier which happens to have a bluetooth function. It's worked every time I've tried to connect to it, and it just plays the audio from the client device throug the speakers it drives. It has no security or any obstacle to binding random devices, and for this reason I'm pretty sure I'm going to desolder one of the components in the Bluetooth circuitry to disable it.
The other device is a cheap little mono speaker that was given to me years ago by family, and I didn't use it for a few months after getting it, because I like good quality audio and I build a lot of my own sound equipment so the appeal of a dodgy little speaker with a dodgy protocol driving it didn't likght me up with excitement. It now gets a lot of use because I have a kid now, and music during bath time is something they like. It's handy to have a speaker that by my and my partner's phones can connect to once paired, and which won't upset anybody if it gets dropped in the bath.
Every. Single. Other. Device. Every other Bluetooth device I've seen used or had used around has been an unreliable source of frustration and anger. It didn't take many iterations of this when Bluetooth devices started becoming common to lead to all Bluetooth stacks being disabled on every device we have in the house, except when it's bath time. We're happier pretending it doesn't exist, and the sense of calm that pervades from we who have discarded it seems to be infecting other family members.
What I'm getting at is that if you get any traction behind your idea to destroy all Bluetooth speakers, could you possibly leave the mint green speaker in my bathroom alone? If not, oh well, it'll be worth it.