I don't like Tweets like that myself and thought it was stupid too. But I've worked with enough large corps to know that it's not the higher-ups who manage those Twitter activities, but rather people they hire who are just told to do whatever gets attention one way or another. I'm pretty sure that if the core team at Huobi saw that Tweet that they would take it down, but it's not their priority.

What they did do, and which was certainly a decision made by the core team, was to add this warning to Hive inside the Huobi exchange after it had rocketed even more than in the Tweet above.

So that's more than enough to say that "they" (the actual Huobi team we've been in touch with, and not someone hired to Tweet) have the right morals that you're asking for. Should they also have kept a closer eye on their Twitter? Probably. But I doubt that Tweet had any effect at all other than PR.