Honestly, I would hope for that as well; but it seems very similar to the enshittification of Amazon (Wired link, archive link):
Marketplace sellers reached huge audiences and Amazon took low commissions from them.
This strategy meant that it became progressively harder for shoppers to find things anywhere except Amazon, which meant that they only searched on Amazon, which meant that sellers had to sell on Amazon. That’s when Amazon started to harvest the surplus from its business customers and send it to Amazon’s shareholders. Today, Marketplace sellers are handing more than 45 percent of the sale price to Amazon in junk fees.
Basically the notion is once a storefront has captured the bulk of potential customers, they are able to extort their suppliers however they want, since it’s the only way the suppliers can reasonably reach the customers.
Hopefully in this case, the publishers can explore other sales avenues; but it all depends on the reach of the subscription service.