not that massive, we're talking six figures. There was a blogpost about this a while back on the startpage of HN.
For something like Mixtral 8X22B with 40B active params you'd looking at the $10M range, and if something gets screwed up during training you can be left with a dud and nothing to show for it, like LLama-2-33B. It's like buying millions worth of lootboxes and hoping something good drops.