If Elon Musk walked into Substack's office right now (probably with a sink) and offered them $585 million to buy it, do you think their shareholders would say "No"?
Not on their life.
They would be skipping for joy. Everyone who owns equity in Substack would be popping open bottles of champagne.
Meanwhile, all those writers that Substack is paying will now be under Musk's thumb -- yet again.
This is why the Fediverse is the better choice compared to Substack.
@atomicpoet History is littered with examples of platforms that no longer exist or are irrelevant, however owning your own domain name, website and list of subscribers will always work out in the long run.