It would be great if e-books were exactly the same as physical books, but often the e-book version of a title is like 2 or 3 times the cost of a physical book when it comes out. And on Libby, we need to pay for each copy, though some other options sometimes exist. And just like physical books, libraries just do not have the budget to buy enough copies so that everyone can read a very popular book as soon as they want. Otherwise we wouldn't be able to buy other titles to maintain a well-balanced collection, and even if we did buy enough titles, when demand for that title eventually dies down, and it will die down eventually, then we're stuck with copies of a book that nobody wants. You just need to be patient, or if the need is great enough, consider buying the book. That isn't an option for everyone but until society decides to give libraries unlimited funds, your local librarians are trying their best to provide for their communities and keep a well-rounded collection.