> I don't really understand why anyone who claims to be a proponent of a free market economy has an issue with a private corporation deciding what type of content they want to broadcast.

I don't know if this is your opinion or not, but in general, this argument might hold more water if "activists" weren't gleefully trying to shut down relatively free-speech sites like Gab and Parler and others.

You can't have it both ways and claim that business can allow whatever content they want and then try and shut down businesses who do just that.