This seems easy to answer - according to French media[1], they were activists illegally occupying[2] buildings to protest rising real estate prices. This is illegal in Switzerland, too. What's the scandal? Authorities using their powers?
[1]: https://www.lesnumeriques.com/vie-du-net/protonmail-a-fourni...
[2]: https://www.lefigaro.fr/societes/a-paris-un-local-du-restaur...