Blackmail, formally extortion or coercion is a crime only when specific kinds of threats (which may vary by jurisdiction) are used to compel someone's behavior.

Threatening to stop offering certain products or services in jurisdictions with unfavorable regulatory environments doesn't meet those criteria in any jurisdiction I'm aware of. European car companies often have models that can't profitably be brought into compliance with USA regulations, and they're just not sold in the USA.

Apple can almost certainly comply with EU regulations while remaining profitable in that market; they're just making a fuss because they don't like the regulations and they hope to get the public on their side.

However a bus driver refusing to refusing/threatening to not provide service to a passenger is illegal, unless in some special cases.

Apple is already somewhat classified as critical infrastructure, like via the DMA. I don't think the electricity provider will be allowed to say 'don't pass that law, or we don't provide your city with energy'. This would result in dispossession.

This might not be encoded in current law. I'm just stating it should pointing to other legal subjects doing comparable things.