I've said this previously. With the old startup model, you might be able to capture significant marketshare for 20 years. You might even be one of the most valuable companies on the planet during that time. Hence, Meta.

But if you want something people will use indefinitely, you need to build a protocol.

Guess what? Corporations don't want to build protocols. Hence, a startup-driven version of the Fediverse will probably fail.