It does happen in Holo, they just tend to mention in the next stream they asked the manager to post it. And is usually reserved for cancelling a stream due to being sick or similar matter. Which I think is nice, also saves them from posting on wrong account while not in the right mind.I'd be more surprised if it didn't happen at Holo, too.
Or if you are HoloID you get locked out of everything until you show a paper from a doctor that you are no longer sick.