You are right that it's not specifically required do donate a certain percentage of your profits. It's even more vague than that. It basically just means that you need to commit to a certain "public benefit" in your certificate of incorporation:
"The Certificate of Incorporation of a benefit corporation commits the company to spending some of its profits or resources (or both) in support of a specific public benefit. If a benefit corporation decides to stop doing business and dissolves, the shareholders receive the proceeds of the sales of assets, after liabilities are paid." (from https://www.delawareinc.com/blog/non-profit-corporation-vs-p...)
I fully agree that a PBC isn’t a panacea. That doesn’t change the fact that you’re confidently asserting incorrect things. I don’t expect that you’ll change your mind, so I’m not trying to convince you, I just want to make sure that the facts are laid out.
What I'm saying is that very likely Bluesky will grow for a few years without making a cent of profit, and be acquired by another company. And this has not much to do with if they are a PBC or LLC or whatever...
% of VC-funded tech startups that exit via appreciable >$0 acquisition is actually not particularly high relative to total failure/success, which makes sense if you think about it. The odds would seem even lower in this case just for mentioning the word "federated," regardless of the tech.
"The Certificate of Incorporation of a benefit corporation commits the company to spending some of its profits or resources (or both) in support of a specific public benefit. If a benefit corporation decides to stop doing business and dissolves, the shareholders receive the proceeds of the sales of assets, after liabilities are paid." (from https://www.delawareinc.com/blog/non-profit-corporation-vs-p...)