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Most of the world's biggest advertisers have stopped buying ads on Elon Musk's X, exclusive new data shows
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
It's probably baked into their contract that there is a fee or other penalty for canceling. Or maybe an AI just decided $10 was slightly more optimal than 0. Or perhaps the contract period ended minutes after the billing period.