My idea is some non profit gets setup to manage a system where someone announces their mortgage and then they can have friends, family and second and third degree friends and families finance your loan.

Let’s say someone buys a $250k house. Each person puts in $100 and then they get a receipt showing they are owed $200 against their 1/2500th share of the mortgage. Repayments are paid the $200 in return in a random time frame of between the first month to the last month 30 years later. Repayment is completely randomized, meaning you could get your money back really soon… Or a really long time from then.

There are a lot of other ways you could build on this idea.