I don't know of any European country, Germany included, where companies are unable to exercise editorial control over what they distribute, unless they fall in very narrow categories (e.g. phone networks, mail carriers).

EDIT: That does not mean I don't have sympathy for the thought that we do need a debate over what level of freedom sufficiently dominant social media platforms should have to ban people. At the same time it's noteworthy just how much we hear from the people who insist they're being censored - most of them have platforms far in excess of most people even after these bans. What they're complaining about is being stripped of a level of amplification that previously didn't exist.