No it's opt-in now. Yes they nag you and might ask you if they can use your transcript to train on but you have to agree to it and it's something you can disable.

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buzer a day ago | parent [-]

That's good if true. When did it change? I very much do remember that back when the change happened the modal I received didn't actually say anything (https://news.ycombinator.com/item?id=45064212) and thus I was by default opted-in until I saw the news and went to disable it, fortunately before the training actually started.

	▲	TurdF3rguson a day ago \| parent [-]
		I'm not sure but I had this same conversation with CC just days ago and it told me to check my settings because it changed. My account is 4 months old and it was disabled so I assume it's been opt-in for at least 4 months.