I think there's an ethical way to both get free use of what should be yours to use, and also support the people who made it.
I'd say this is the case for Amazon as well, if you have an actual Kindle. I was able to convert my whole library to standard epubs last weekend using Calibre.
Eventually, we'll just end up in the same situation as we are now with video DRM; DRM being hard enough to bypass that the methods of doing so will be closely guarded scene secrets, but the output of those methods will hit Z-lib / LibGen / AnnasArchive / all the usual places.
The thing with books is that they're small by todays bandwidth and disk capacity standards, so it's really hard to stop their proliferation.
https://www.pcmag.com/how-to/download-kindle-books-to-comput...
See, but that's not actually the same thing as DRM-free. It's adversarial interop that's temporarily allowed to work, but if said interop becomes popular enough the publishers will force Kobo to fix it.
At this point I'm really only interested in spending money on books that I can actually own—either physical copies or (where available) fully and legally DRM-free ebooks. I want my purchases to send the right message to publishers: that DRM-free can work.