It's also tacky and annoying. None of the intended participants in the conversation want that, and that kind of behavior is either going push the conversation onto private channels or motivate blocking.
A lot of people value an audience of "real people like me, minus the corporate hustlers and corporate ad-bots." It's unfortunate that are current society lets the latter swoop in an choke to death all kinds of good things.
Your analogy doesn't fit to twitter though because this guy isn't having a private conversation; he's broadcasting his opinions publicly to the world. Imagine someone with a megaphone in an outdoor mall shouting about how shitty a company is. People would probably love the idea of a rival from another company engaging with that guy and saying "yeah, they suck, that's why I started this company, check us out." I doubt many people would find it creepy.