Cryonics service providers do that. Here's an example from Alcor, the largest: https://www.alcor.org/library/the-alcor-patient-care-trusts/

"At Alcor, patient storage costs are paid from two separate but interrelated Trusts: the Alcor Patient Care Trust, and the Alcor Care Trust Supporting Organization. … This conservative funding arrangement is designed to cover the cost of patient storage solely from the income from the Trusts, thereby assuring that such funding will continue indefinitely into the future."