You can change the framing and gain new insights.
In the mastodon.technology shutdown post linked, the author describes a situation where the workload exceeds the capacity of an ordinary person, even a motivated one. (There's an argument to be made that this makes for someone who isn't merely an ordinary person—but that strengthens the point I'm about to make, instead of weakening it.)
How do we fix this problem? In other words, how do we ensure that the workload of an "instance" remains within the realm of feasibility for an ordinary person?
Answer: making it the responsibility of each person. A single volunteer admin should not be responsible for hundreds, thousands, or more other people. Getting each person to shoulder their own personal load is far more tractable.
What's absent, currently, is the means for each person to do so on their own in a way that we can realistically expect. That can be worked on. Software like Mastodon can be improved upon—necessarily drastically so—and infrastructure configuration can be improved to, to the point that it doesn't even feel like infrastructure configuration.
For people with very large spheres of influence, like Aral Balkan who recently disclosed that he's spending ~600 EUR per year for his instance, they can seek help, mining from the resources that are at their disposal that are a consequence of their wide reach. For ordinary people with up to a few hundred followers, they won't need to be exposed to this.
As for the sentiment behind the remarks about "dumping fresh content into our account for free", recognize that the fresh content has value, and there are ways to subsidize the resource use by parties with an interest in being able to capture some of that value for themselves. When you post a widely shared piece to your blog, then Google for example benefits from this, whether you're using Google Ads or not. It's the mere fact that there's something on the Web worth looking at that makes this beneficial.