I've had the pleasure of setting up limits because Microsoft needed billing policies before our C-levels have even gotten it on their agenda. So I set up a sort of conservative $200 personal limit, but then setup a $1m shared limit pool that anyone can be moved into with management approval. I suspect our limits will be much higher than this once the C-levels make the decision on an actual company policy. I think we'll see these spending limits mainly used as guardrails to prevent accidental spending, but that there will not really be a ceiling, just some approval gates. Some managers are already requesting usage reports, but not to track spending, they want to see who uses too little AI.
This is the difference between enterprise and small companies and individuals. When you spend $500k a month keeping your toilets stacked with papertowels, toiletpaper, soap etc. then $1m a month on AI isn't going to raise any eyebrows.