Hmmmm, this is a real Libertarian dillemma. Should companies have the freedom to set their own rules in how they do business or not? I recall Tucker Carlson standing with Jack Philips, the baker here in Colorado (the gay wedding cake fiasco) who took his fight against having to serve gay customers all the way to the Supreme court. So if Jack should have the freedom to make a decision on his religious / moral code and decide the type of customers he wants to serve, why should Apple, Twitter, Facebook or Google not be afforded those same freedoms? Just because they are larger? This isn't preventing anyone from using Parler. This would just make it less convenient as you wouldn't have the shortcut to get it off their stores. You'll have to use a web browser instead. Big deal. They can't prevent you from accessing the site, but they also don't have to make it easy for you. Facebook, Apple, Google etc etc are all capitalist companies. They aren't government regulated utilities like power, roads, postal services, etc. You can't force a company to partner with your product.

Whether you or I agree with what Google or Apple or any other company does in this fashion, I think you have to be consistent in your idea of freedom in the business world. I don't like hypocrisy and I think a lot of people expect to have their cake and eat it too (See what I did there?).