carfat Because they want your money.
I'm honestly not surprised, they even locked down translations that have been out for a year or so, possibly even longer. Novels I've come back to catch up on have suddenly lost half their chapters behind a paywall, leaving me with less of the story than I had a year ago, even after I put in stones.
Long story short, just skip this BS and pirate it from elsewhere (though don't do that for independent TLers!)