Arbitrary bans and deletions are illegal under German law and are open to legal recourse in Germany. A ban must be based on a violation of ToS or law and if the case goes to court, google would need to substantiate that. And even if there’s a violation of the ToS, the court may rule the ToS invalid or require a warning before a complete ban. These cases usually don’t make it to court though, often a sternly written Fax from a lawyer will result in unbanning.