You should file an objection to the registration of a competitor's trade mark if your trade marks could be confused with one another. In other words, if the impression is given that the goods or services concerned originate from the same company (or from companies that are economically linked).
Harmonisation and partial revision of guidelines as of 1 July 2023
Conference on Intellectual Property & Sustainability at the University of Geneva
Symposium: "Best practices in the fight against counterfeiting & piracy – NFTs not your cup of tea? Well, they should: NFTs as a new way of fighting counterfeiting and piracy"