I think they would be kicked off whatever fund raising platform they use pretty quickly.
Voat's content is by reputation alt-right, and bald-faced fascism. It's the fringe of the fringe, and the type of content that gets you cut out of payment networks.
Though, speaking of business sense, I don’t see why Parler would want Voat. They already have their own community. If they saw business value in a forum system, they would just build it.
But to the moon, right!