> any switch from opt-out-by-default to opt-in-by-default sucks

It’s the reverse. This was opt-in and is now opt-out. Opt means choose so when “the default is opt-in” it means the option is “no” by default and you have the option to make it “yes”.

> they're now opt-out rather than opt-in to your data being used for training

This is what the comment I was replying to said. I took that to mean "you have to opt out (ie you're opted in by default)".