Thank you, Mr. Shields, for the question.
The CRTC rarely revokes a licence. It would do it for reasons of non-compliance.
The most recent case I remember was not that long ago. A radio station near Montreal. CJMS Saint-Constant had its licence revoked following a public hearing, and it was over repeated instances of non-compliance. The commission also revoked some licences for Aboriginal Voices Radio when it felt that over a period of more than a decade, there had been repeated non-compliance.
The commission has in the past, then, used this power, but it has been used fairly sparingly. Most licences are renewed.