There's also a non-obvious positive risk, too. Specifically, the appreciation of real estate prices. If the landlord owns a $120k house that they expect to increase in value 1%/year over their mortgage rate, then that's another $100/month that the landlord doesn't have to get in rent.
In other words, the landlord is holding an equity position in the real estate they are leasing to you. This equity position can appreciate, giving a non-rent-collection profit source that increases the price they are willing to pay for the real estate in the first place, lowering their profit as a percentage of capital invested.
But it can also fall, as we witnessed not too many years ago... Any speculation on real estate will already have been priced in and the expected profit from buying a house minimal.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.