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The GDPR notices are supposed to make it as easy to opt out as to opt in, so they shouldn't really be warnings.

The problem is websites have apparently decided it's safe not to comply with that portion, presumably knowing everyone would opt out.

You can always "opt out" by not using the web site, unfortunately.

So I don't know that they would lose any challenge on those grounds.

That doesn't count. You can't refuse service (or provide worse service) because someone doesn't consent to unrelated data collecting / processing.