I've never been anti-bidbot. I've used bidbots myself experimentally, but after making an overall loss, I decided not to use them again. I like transparency, which is an integral part of the blockchain, so I welcomed TransparencyBot right from the start. But I've always been ambivalent against bidbots, and I've posted about this several times. I see Steemit as a game (like the game of life!) and it's up to each Steemian how they play it.
What I don't like is aggression, bullying and scare tactics. This behaviour from Booster is astonishing, and I haven't seen much of this kind of thing on Steemit, thankfully. It makes me regret the few payments I've made to Booster in the past, and I won't be making more in the future, even if I decide to use bots again (which I probably won't).
I suspect it's not representative of all bot owners, but if this is designed to destroy @transparencybot's campaign, I think it's having the opposite effect.