This is like Google Ultra for personal accounts. I signed up to see what it was like and then assumed I would be able to disable training on my data as a paid customer. The only way to disable training on paid personal accounts is to disable history (no chat logs) which makes the service much less useful for me.

For Google Workspace accounts that use the Ultra plan you can disable training while retaining history. I didn't bother signing up again. It is user-hostile.

Yes, you will have to pay lot of money and you will have to surrender data too.