I will hand my credit card number over to the charity that gives 5 new copies of a book to any library that has one stolen.

Or even more basically:

• what’s good for business is generally not what’s good for society.

Get infuse. Not open source, but the subscription is cheap, and it just works. Library features aren’t as nice as Plex, but can share the same library, so you can still use plex for metadata etc.