This strongly suggests 'something is wrong with this picture'. The publisher, distributor, whoever, provides access to titles via a web site, often with a password and the customer is free to search to their heart's content. Libraries are freed from the drudgery of claiming, shelving and binding serials, costs are cut, budgets stretched, and everyone is happy. Until the library decides to discontinue a title. All of a sudden, there are no back issues.
Access is gone.
Maybe the publisher will still allow access to the electronic archives, maybe they won't. Why the big national and research institutions like the Library of Congress, the British Library, Linda Hall, UCLA, or whomever. Then, if we ever need it, regardless of what happens to the publisher or the technology, THEY will have the item. For a very short time, I worked as a sales rep for a subscription service company. That was over 10 years ago, but I've always kept my interest in this newsletter.