Private companies can host who ever they want on their service platforms.
But, let's not kid ourselves with the notion that these companies are acting under some altruistic greater good of society in mind and not ultimately acting in their own self interest.
"Hate Speech" is the most bullshit sham of a policy of the modern era. It sounds so noble, yet it so subjective and loosely defined that it can be applied to pretty much anything you want by putting the right spin on it. Making it a useful tool to silence opposition without looking draconian.
Do you really think major media services that compete with each other every day all just spontaneously came to a consensus to remove Alex Jones without a common motivation compelling them? These companies benefit from the "Alex Jones" of the world directly and indirectly and they just don't want to admit it because it isn't conducive with the image they want portrayed. This is like negotiating a Nuclear Arms Treaty between super-powers. No one likes having him around, but unless they all agreed to drop Alex Jones, none of them would because no one wants to be at a disadvantage in the war for market-share. Apple isn't going to drop Alex Jones if it means people subscribing to Spotify for that same content instead (and vice versa). Who or what could compel these companies to all act to disarm this particular warhead named Alex Jones together?
35 years ago America had over 50 independent Media companies... now it is down to less than 6. The Media, especially in America, is a giant propaganda machine to influence the public for profit. The Obama Administration even repealed the anti-propaganda law that prevented the American Government from using propaganda on the American public. More and more of the power to shape society is being concentrated into fewer independent, unbiased sources. If that isn't a worrisome trend, you're not paying attention.
Further more, if we are that upset and troubled by this action, we should stop using these services if we don't like the implications of their policies or their influence on our lives. However, we can't... we are all held captive by our dependencies to these services in our daily lives. These companies know this. The government knows this. The only people not aware of the game being played here is the general public who is being played daily by rules they don't understand if, that is, they're aware of the game at all.