If the corporation is still giving a good service then libertarians like it. If it acts as a monopolist, then libertarians would dislike it and look for alterna

If the corporation is still giving a good service then libertarians like it. If it acts as a monopolist, then libertarians would dislike it and look for alternatives in the free market. That's why libertarians want a free market, to be able to do that when there's natural monopolies. If you use the government to split up the big corporation, you're not an anarchist.