This take makes it sound duplicitous as opposed to simply sound business decisions. And if apps are used to perpetrate high profile crimes (to say nothing of the many threats and instances of appropriate moderation steps being nonexistent), why should the "suppliers" of apps be beholden to anyone to provide them? MAybe they feel they have a duty to promote safety.
It's because they're enjoying certain benefits and protections of being "platforms"
And the types of censorship went beyond "safety precautions".
They were already shielded from liability. Amazon webhosting wasn't going to get in any trouble from something an individual Parler user said, no was Apple for merely having Parler on the App Store.
Safety precautions was a nonsense excuse to cover for the real reason, which was that all of the tech big shots were ideologically aligned at the time, and that was their way of letting dissenters know "we rule the sandbox, and we'll decide who plays in it, and if you build your own sandbox, we'll make sure people can't get to it"
For instance, AT&T's cellular and internet service is a platform of sorts.
The protection they receive and enjoy, is the fact that if someone rando phones in a bomb threat using an AT&T line or someone uses their internet service to look up something illegal, AT&T is not liable for it, the actual person using the platform is. However, that also means that AT&T can't intentionally drop phone calls and throttle internet speeds of people who disagree with them politically as a means of suppressing certain viewpoints or preventing the other team from being able to organize.
For what it's worth, Jack Dorsey (the guy who made the decision to ban Trump from Twitter, which was the catalyst for Parler exploding in popularity overnight), regretted banning Trump, and made reference to "an unnamed activist" being behind some of the actions and moderation policies.
Twitter co-founder Jack Dorsey, who served as the social media company’s CEO, has expressed regret over banning former President Donald Trump from the platform.
www.mediaite.com