Somebody is reading all of it
I have spent the last couple of years pasting things into a text box. Client code with a bug in it. Half-written emails I was not sure about. Notes about a project that is not public yet. The occasional paragraph about my own life that I would not put on a billboard.
All of it went somewhere. That is not a suspicion, it is the product. These tools are trained and improved on what we give them, the terms say so in plain language if you bother to read them, and I did read them, and I carried on typing anyway.
Here is the part that worries me more than training. When the same tooling arrives at work, it arrives with a dashboard. An assistant that reads your tickets can report on how long you took. An agent that writes your code can log every prompt you sent it. A system that drafts your replies knows how you talk to customers and to your boss. Run that in an office and you have rebuilt workplace monitoring, with better manners and a subscription invoice.
I am not claiming anyone is listening to me personally. That is not the problem. The problem is that the record exists at all, that it sits with somebody else, and that the rules about what happens to it were written by the party that keeps it. A log you cannot read, delete or argue with is a log that can be used against you later, even if nobody means to today.
So I have changed my habits, and the new ones are boring. The things that matter, my own keys, my own client data, anything personal, do not go into a hosted box if there is a local option, even a worse one. I keep my own copies and I export what I can. I read what a tool keeps and how long it keeps it before I trust it with a day of my work.
It will not make me invisible. It just means the record of my working life is not entirely in somebody else's filing cabinet.