How is ComCom financed ?

"The costs of the Commission are covered by fees" (art. 56, para. 4, LTC).
The Office collects not only fees but also licence fees, in accordance with the decree on fees in the telecommunications sector (art. 2, ORDT - ordonnance sur les redevances dans le domaine des télécommunications).

https://www.comcom.admin.ch/content/comcom/en/Homepage/the-commission/organisation/frequently-asked-questions/how-is-comcom-financed.html