Afaik to poison AI data.
Of course if it's only them doing it, it will be too little data to affect AI training. And if enough people do the same to affect the training, it'd just be the way we talk now and AI wouldn't be affected either. So it's pretty pointless, but with bad externalities (being annoying), much like AI…
That's not a new thing, i.e. already can happen and you don't need AI for it to be a nightmare
https://www.pentestpartners.com/security-blog/vulnerable-wi-fi-dildo-camera-endoscope-yes-really/
https://www.pentestpartners.com/security-blog/screwdriving-locating-and-exploiting-smart-adult-toys/
Luckily there's people penetration testing dildos!