Example: article in arXiv gets later published in a journal. Will the arXiv article version be still available for anybody? Only for non-EU people? Will be removed from arXiv? None of these?
Smaller platforms are exempted on the directive (ie, startups, single person corporations, etc.) as well as anything that doesn't do profit oriented content/active content moderation.
Why would you? The Link Tax and Upload Filter specifically affect service providers that moderate user content to generate profit, if you upload something with explicit consent of all rightholders then this is explicitly exempted from the directive.
So? They're not published there illegally, arXiv (AFAICT) is non-commercial and publishing similar content elsewhere does not retroactively make the existing content illegal.
Oh I replied to another comment. The answer is "no". Fact is that 1/3 (anyway a significant proportion which can be referenced) of the arXiv articles appear later in journals. So it is a totally credible concern. The arXiv has a system of copyrights which allow them either a perpetual non-exclusive dissemination right, or a CC-BY copyright.
Depending on the journal and its licensing agreement, they may not even accept manuscripts which have been circulated as preprints. Some of them will allow you to publish the corrections made through the review process. Some of them will even allow you to distribute the final article as published. But this is essentially unrelated to the law being discussed.
Well in mathematics and physics the usual thing to do is to first post on arXiv and then submit to the journal. ArXiv references are totally allowed. I heard that the situation is different in other fields but as you say this is not relevant for this discussion.
