This is happening on browsers of their customers. And I'm quite sure that if Google hits a company that competes with Google services there must be a law that they will be breaking.
There was a big case in Poland where Google blocked a SaaS web shop provider using the same exact mechanism [0]. Polish courts decided that Google claims displayed on block page were untrue. Unfortunately, the suing company did not receive compensation, because Google Poland does not operate Chrome browser. The court indicated that the right party to sue is Google incorporated in USA...
[0] https://www.silesiasem.pl/iai-przegralo-proces-sadowy-z-goog...