Yes they are training on your business's data so that their AI can replace your business later. If you don't believe it, name one thing they didn't train on.

It definitely looks like the old tale come true - at Microsoft people would warn against using Google because then Google could figure out what we're working on, since it was pretty easy to tell where a query was coming from.

Sounded far fetched back then, and on the face of it illegal, but now it's just common sense I imagine.