You may notice that the US population has grown, and continues to grow, and the abstract group comprised of "people who rent homes" continue to grow, and to need more to rent. Corporations happen to be the ones filling this need now. Of course there is nothing that says they have to, or that it has to be corporations, nor is there any special noble virtue that we should ascribe to them beyond that of a prudent investment, nor is there some special reward beyond what they can earn in commerce. It is also possible that significant new construction, falling home prices, or general prosperity could make members of the group of renters leave the group, in favor of ownership.

Renting something bought by an individual (or a very small corporation) was possible and remains possible. But if there was enough of this happening, the corporations who rent might have serious difficulty finding a profit.

It is worth noting that, in a major shift, major home builders expect 50% of their business will soon be in built-to-rent neighborhoods, up from something like 6% today. This is an illustration of how prices are a signal used across the economy to determine what gets done. (Taylor Morrison Home's numbers, from this recent article: https://www.wsj.com/articles/built-to-rent-suburbs-are-poise... )

I refer to the US because it is closer to me. I understand that Canada experiences similar trends.