Until the TOS clearly says otherwise, as far as I can see, the TOS at least implies this:
1. We will not use your data to train AI without your consent.
2. By accepting these TOS, you give your consent to everything in this long list (which includes training AI).
However, many companies reckon they'll get away with it, the enforcement is not universal and rapid, and I don't trust Zoom as far as I can throw it on this particular score.