I think it has happened actually. Early on HN was almost purely entrepreneurial although through a tech POV. These days, it’s much more general or broadly tech related. The discussion I gather is most people here are tech employees and not necessarily entrepreneurs.
It’s obviously has not gone to hell like the bot ridden examples, but it’s drastically different IMO.
The bots aren't completely dominating here yet, because the price/benefit isn't really there yet.
Twitter is a source of news for some journalists of varying quality, which gives them a motivation to influence.
On HN, who are you going to convince and what for?
The only thing that would come to mind would be to convince venture capital to invest in your upstart, but you'd have to keep it up while convincing the owners of the platform that you're not faking it - which is gonna be extra hard as they have all usage data available, making it significantly harder to fly under the radar.
Honestly, I just don't see the cost/benefit of spamming HN to change until it gets a lot cheaper so that mentally ill ppl get it into their head that they want to "win" a discussion by drowning out everything else