I do not think granting someone an exclusive right to sell their new cultivar for 20 years is particularly dangerous, especially when existing variants don’t disappear. I like that someone was incentivized to grow Pink Lady and Cosmic Crisp apples back in the 90s and 2010s and I struggle to see where any cruelty was involved.
And this isn't even a cultivar. It's a commodity crop in which the only difference between ordinary seeds and Monsanto's seeds is that you could use Monsanto's Roundup pesticide on them without killing them. The seeds were literally just a utility for using a specific Monsanto herbicide system.
Apple cultivars are interesting because they are often developed by governments motivated to promote the existence of a healthy farming industry, not by private monopoly rights. Case in point, the Cripps Pink (aka Pink Lady) was developed by the Western Australia Department of Agriculture, and the Cosmic Crisp was developed by Washington State University.
(Honeycrisp is another fantastically successful government-funded cultivar, this time by the University of Minnesota. But it apparently led to the spontaneous breeding of the SugarBee, which is privately owned.)
The problem with patented seeds (and everything else) is the owner can decide who gets to use them. No one should hold that power.
If patents worked as a royalty system where you're guaranteed to get a license if you pay there would be no problem. But right now Bayer can use their control over Roundup Ready plants to make farmers buy more products they don't need, or punish them for dealing with competitors, because they have a monopoly.
And it also lets them set the price to anything they want because competing with them is illegal. Exclusive rights are always like that.