No need to refuse them communion when they don't attend Mass in the first place.
Do their bishops count/report their numbers as adherents?
I can only assume those numbers, if counted, are from the parish lists; again a very small number these days.
Do their dioceses receive tax revenues from the state as a result?
Canadian churches get no tax money. What ever gave you the idea that they did? One of the Fundamental values of Quebec Society is Separation of State and Religion.
These election results are not about religion of any type.
Their schools:
Catholic board needs clean sweep [Toronto Catholic District School Board]
Catholic trustee tells court she wouldn’t have tried to influence vote [Toronto School Board]
Non-Catholics Trying to Lie Their Way into Teaching at Ontario Catholic Schools
Jobless, non-religious teachers to turn Catholicism in attempt for employment
Catholic schools want your tax dollars. Real bad.....