Must be. In particular: the only landlord I ever got a security deposit back from automatically was a corporate landlord.

More broadly: if your concern is that the landlord isn't going to fix the furnace or whatever, you can address that without distorting the market just by creating causes of action, penalties, and fix-and-deduct ordinances to shift incentives.

Banning corporate landlords reduces the supply of housing (larger institutional investors are the primary builders of dense multifamily), and privileges individual owner/landlords who do not have a better track record or better incentives or better resources.