Of course a private company can express whatever view they like. The real danger here is the echo chamber effect at play. Most of tech is heavily biased towards the left/authoritarian side of the field lately which is a shame. The early days had places such as alt.sex.hamster.and.duct.tape with a voracious defense of freedom of speech. Now I see hate speech clauses showing up in all sorts of places. In the end, if you only allow admittance of similar views and like thought you will create a mono culture. Mono cultures tend to fail.
Google is forgetting that nearly half of our nation voted for the president. I wonder how many contracts for google's cloud services will be renewed by the federal government? This sort of obvious bias will likely have a measurable effect on the bottom line. Maybe they'll learn from this or fail and someone else will learn from the mistake. Likely not though, I suspect more collusion to ban "bad" actors such as Alex Jones.