CERB is a pipeline that funnels money from the government to landlords & employers (capitalists) thru tenants/workers. It ensures landlords still have paying tenants & workers have homes from which to reproduce their labor power, to show up to work once again when the time comes.
That government money in the first place comes from the value produced by workers' labor power (taxes & deductions), and then workers, even when not working, have to pay capitalists for all the necessities of life in order to stay housed & employable.
So capitalists are by far the biggest recipients of CERB since nearly everything must be paid for with money, not just rent but also food, clothing, etc. If people didn't have to pay almost their entire income on rent & necessities, they wouldn't have to show up to work each day.
The gov't could decide that paying the majority of employment/income assistance money to landlords every single month was a waste of money & build rent-free housing instead. But then it wouldn't be acting as a pipeline supplying capitalists with low wage workers constantly.
And at the same time, the gov't wouldn't be providing landlords with a steady supply of paying tenants if it put money into rent-free housing instead. The gov't prefers to pay a larger amount of money to people who already have it (and property) than a smaller amount to workers.