The common belief is that Canadian online casinos cannot manipulate the games' settings easily (like everybody was concerned about land-based casinos).
However, there have been signals regarding Play'N Go slots with 91.51% (RTP) instead of 96.51% (publicly announced by the software provider) in some particular casinos. (Play'N Go slot Holiday Seasons - adjusting RTP controversy)
Remember: Even a 5% decrease in RTP can be totally dramatic for the player.
Only when gambling at NetEnt casinos (regulated with a central server), you can have an honest not adjusted consequentially RTP (rigged by the casino itself with the “(in) valid” reason of jurisdictions request).