So there's a win/win opportunity for an independent multipolar non-profit entity to complement the dominant corporation. Bluesky benefits just as much from FoF as the AI-focused companies (including Mozilla) who are the majority of the FoF 'custodians'. The need for an alternate Relay is just a convenient artifact that many people have (for whatever reason) focused on.
BTW this from the article was hysterical:
"The "Fediverse" has been around for a while and though it has never been more popular than it is now,..."
No, actually, the Fediverse had more than twice as many active users two years ago than it does today. Don't get me wrong, there's still a lot of interesting stuff happening here, but let's be realistic!