This will vary on area. Might not be doom and glum for all.
We not allowed more than 2 under 18 months. We not allowed more than 3 combined infant and toddler ages - under 35 months. We only allowed 5 max and our own kids count until they are 12.
But I usually manage to fill all 5 places even with only two infant or three infant/toddler combined. So it likely area specific. And this not high demand area. We are a good 45 mins out of Charlottetown which most populated area so we have limited client anyway.
There is some people who manage to earn enough from this as single parents. Most provinces have restrictions similar to what is coming for Ontario already and those single income providers have managed to survive but it will be tight for sure. My husband is semi-retired now, and our children are grown up but even with small second income, I do see difference in tightness of money. We have some mortgage left but no other debt and no car loan so like other provider, luckier than most. But there have been times where I've had whole year of one vacancy or other when fishing industry is poor or when local companies close meaning some go West. I think if you expect to be full at all times, it might be naive.