Are social media's recent bannings a freedom of expression issue?

A recent closed thread asked if it was a first Amendment violation. It is not. But one poster in the thread raised the issue of whether it might be an oligopoly issue. In a world in which a very few companies, and in fact a very few individual executives, control the soapboxes of the public square, should there be some consideration to that power by a very few, that it not be applied capriciously?

Case made by Russian dissident and assassination attempt survivor Alexey Navalny.

Neither is Merkel a fan.