What has been beaten into me over the last 30 years
it started with software, so I stopped installing anything that wasn't open source. Then it was music, but for most things in most years I could buy CDs, rip the CDs, store the music digitally and put the CDs in boxes in the basement.
Then it was books, and I thought that we had reached an equilibrium where most of the booksellers would send DRM-free epubs and I would be happy to pay them; and a few wanted to send DRM-free weird formats but I was willing to do conversions. But mere conversions aren't enough; the Beast That Exerts Excess Market Power has decided that their customers aren't allowed to get DRM-free copies of the work that was advertised as DRM-free.
So I will not be dealing any more with them, and you shouldn't either. They might still be the best way to get a hardcover delivered to my door, but I only buy those now for authors I have a high desire to coillect signatures from.