The opt-out option doesn't exist in my setting. So it seems like they are targeting areas outside of the EU for this slurping, at least on the surface.
Since I can never prove whether my data was included in the AI or not... they could slurp it regardless and claim ignorance until some internal whistleblower brings it to light.
But that isn't enforced with the teeth it really needs, and I really don't trust that companies like LinkedIn will do the right thing, nor the legally required thing where they differ, given how much effort it could be and the likelihood of anything being done about it if they don't and this isn't obviously detected (or a whistleblower speaks out). So my choice is to walkaway from the service (or never use it in the first place) or just accept that my stuff will get used that way.
That, and given it is public information that we've already agreed to let LinkedIn use however the hell it likes via signup and “by continuing to use this service”¹, so there would be the whole “is it even a privacy issue?” argument² to have before getting to that nitty-gritty.
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[1] again, maybe there are legal routes to stop that, though I don't know about you but I certainly can't afford the time or legal resources to investigate further
[2] I'm assuming “right to be forgotten” doesn't apply in this case, as we are talking about a particular use of the information not wanting the complete removal of it from all their services.
Little point. It'll be like facebook's opt-out and only cover things you post/update going forward. Everything you've already posted has already been slurped into the training set and won't be taken out and the model(s) retrained.
The only way to show disapproval in this sort of behaviour that they'll feel is to stop using services that use auto-opt-in for anything, and not enough people are likely to do that for it to be effective.