The clinic we use in Ontario probably for tired of registered patients going to other doctors, but we had no choice. We couldn't get appointments with our doctor for weeks if not months. They started displaying posters warning us against going to other clinics but I don't recall there being any of getting struck off the list as a result.
The clinic started offering walk in appointments on Saturday mornings for registered patients as well as evening appointments for more urgent, non emergencies.
Now they're slow starting to charge for more and more small things that used to be covered by OHIP.