I'll definitely check it out. That said, I'm starting to feel a lot more skeptical of the ability for even founders to manage stuff like this. I would say the same of my own OSS as a "founder," but if my company controls it in some way then I'm not sure there's a reasonable way for me to ensure that continues in perpetuity. At least not via a split model like a lot of these recent news stories have revolved around.
From what I've seen of Mitchell as well, at least in the past, I kind of doubt this is something he would have gone through with on his own.
I think the easiest way to manage it is essentially to do nothing. Accept open source contributions without a contributor license agreement and their copyright locks in future maintainers, yourself included. Extricating those contributions eventually becomes impossible without a cleanroom rewrite that is usually economically impractical and way too risky to a business with revenue.
This requires a copyleft license, and can be bypassed if all contributors agree to sign away their code to a company trying to relicense and monetize the code (as the Audacity contributors did for some reason).
From what I've seen of Mitchell as well, at least in the past, I kind of doubt this is something he would have gone through with on his own.