Only if you get caught, and it's pretty hard to get caught when you peek at some logs in the servers located in the same room as you. Besides, leaks happen all the time and the fines aren't too bad either.
There are ways to set up incentives such that large corporations will follow the rules. There are myriad examples of this. But in most cases you can ask what is more profitable: Taking $1B+ a year from Apple for hosting an internal ChatGPT service from them, or maybe, if they're lucky, stealing trade secret that MS will never be able to compete against Apple with anyway?
This is all hypothetical; I just want to point out that these businesses are not just waiting to do evil things, they simply respond to incentives, like any business.
That's been a major problem at Amazon where they launch competitors to their biggest and most successful marketplace sellers' cash cows