Amusingly this seems to be at least the second cycle of this? A wave of these were posted by web frameworks’ official accounts a couple weeks ago. A glance at the Amtrak one shows BART tweeted the same single word tweet in July (but I don’t know if it created a similar chain of copycats). “Brand Twitter” is such a bizarre overlap of marketing and seemingly candid internet culture.
Yeah I don't know what the true origin was but Theo seems to think he started at least this cycle back 2+ weeks ago: