LinkedIn doesn't need to obey to EU law. It needs to obey to American law, which allows LinkedIn to do business with anybody (other than people from sanctioned countries) whilst complying with US law. EU's laws don't matter in the US. The EU can sue LinkedIn, but LinkedIn can just safely ignore any lawsuits and ignore sanctions, because they are an American company subject to American laws.
EU citizens are willingly subscribing to an American service, then complain the American service doesn't abide by EU laws. That's laughable at every level, to any individual with a modicum of intelligence. If you don't agree to the terms, don't use LinkedIn. You are not entitled to anything.