Building something big alone is really tough and demoralizing. If this is a way they can mitigate that until they can find others to join them, more power to them. However, I've also heard of the dangers of oversharing early and losing the incentive to finish the project because you already got the attention dopamine hit.
Plenty of stupidly successful and wealthy people have risen up by getting people to pay attention to them. Jobs, Bankman-Freid, Musk, and so many others found their success largely on cultivating their public image moreso than on their products.
There does need to be a good product to back them up for long term success. That's where Bankman-Freid failed. Jobs was successful, and the products/company he created have outlived him and his image.
That's one of the things I still find impressive about Steve Jobs and his legacy. While Apple isn't the same company as it was when Jobs was alive, it's still a wildly-successful, innovative company. They still do "unheard-of" things, like designing and building their own SoCs and taking a stab into product categories like Vision Pro (regardless of whether or not it ends up being successful).
I think a lot of people (myself included, to some extent) thought Apple would lose its way (again) after Jobs died. It's a testament to the company he (re-)built and the culture and mindset he curated that it's still doing well.
Bankman-Fried, meanwhile, built a whole lot of nothing, and had no integrity.