That's not fair. Medium's content is community contributed. There's a lot of value in there. Let's not throw the baby with the water.
if the author cares so little about their readers that they choose to distribute their content on medium, there's a good chance that content isn't worth reading.
What's so bad about it?
An author may care so much about readership that they value reaching 50 million people, over a few dozens, if the price to pay is some inconvenience with the medium (see what I did there?)
That community of content creators chose the platform for the benefits of discovery, SEO and convenience. While I agree that there's great content on Medium, those upsides come with a few downsites for content consumers and losing a few of them comes with the territory. It's still a net positive for creators anyway, otherwise Medium wouldn't be a thing.
One easy way to communicate to said community that Medium provides a terrible experience for readers is by reducing page visits so that they start wondering about it and look for alternatives.