Generally if you are paying full price (paying per token), then it's not used for training.

If you are not paying, or paying a consumer level price ($20/mo) you will be trained on.

ETA: In the terms they say they use your data because "free" is the only option available in preview. However it does say you can disable sharing in your settings...

There is a setting to disable telemetry, unclear what this means though.

That's not quite how LLMs work.

Not but you can be quite sure somewhere deep inside the TOS there is a line saying their telemetry swallow your soul. If not, it will be added. It's google, that's what they do.