Corporations might accidentally help if they try to make their own instancss, like if you sign up with google to join the fediverse, realize most instances block googles because its corporate, then they make an account at non corporate version.
I think the best way for it to grow would be making it easy to self host, yunohost maes it pretty easy, but more managed hosting options competing or more of the big ones offering it would go a long way.
Are there any fediverse games at all?