This is a real problem with discussions about copyright, because this is a great example of something that is a mic drop on a message board that will get you tossed out on your ear in a court of law.

we need to stop looking at accessibility as something we add occasionally to a product when things are going well and we want to feel nice about ourselves.

the best way to do it is through things like this, where the content is available to you and you can choose how to consume it - dark mode, but maybe also reader mode, large fonts, wide screens, text search, etc - these should be considered the basic necessities, and then anything you want to do to make it look nice and feel creative is on top, as an option - even the default option if you really care about marketing over content.

Re-read my comment, I said that anyone can do whatever they want with their own copy. But once they start distributing a modified copy is when their is a problem.