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Hoopla and Libby are both free to you and with your library card, so that’s a benefit. Libby IMO has the best selection, including more popular stuff, because the limited copy style of lending means that they can pay for (and get licenses to) more hugely popular stuff. You have to wait for some stuff, though.
I’ve read a lot more through Everand as a paid library than I ever did through kindle unlimited. I use it more for audiobooks than ebooks, but both are included with the subscription. They’re both pretty limited libraries, and both have pretty bad discoverability, but if you’re just looking for reasonable quality and not specific titles, you can find stuff.