For some literary readers and those interested in indie/self-published works, it seems that Kindle Unlimited is well worth the cost.
Easy to use:-
The convenience of use is at the top of most users’ lists of reasons to use Amazon Kindle Unlimited. There’s the app, which is compatible with Kindle devices, and you can quickly access the main Amazon website to purchase the books. You may simply ‘check out’ a book and easily return it. Even if you’re not into technology, using the subscription service is simple.
Multiple books at a time:-
Getting a few ebooks at once as a library customer is usual, but they return them before getting more. Amazon Kindle Unlimited provides upto 20 digital books, audiobooks, or comics at once, so if you’re going somewhere, You have the option of bringing 20 new books with you.
Source: https://learningtoday.net/what-is-kindle-unlimited/