Many tenants that are employed with enough income find a security deposit a barrier to entry.
A prospect tenant applied and qualified to lease an apartment. A security deposit and the 1st month's rent was required. Prospect tenant only had the 1st month's rent but not the security deposit. Landlord said, "That's alright, I can take out a guarantee with Jack and Landlords on your behalf and I'll be covered for damages up to your first month's rent amount. But you will still pay the cost of the guarantee each month in addition to your rent. After I receive your rent each month, I then pay the guarantee company. The cost is 65% of a month's rent paid over 12 equal payments. After the twelfth payment, it drops off and stays effective until you terminate your lease. It's non refundable but you can lease today."
Jack and Landlords is the alternative that unlocks the door to tenancy.