You've never heard of them before because they weren't worth the risk. If the lender sees that the deed has been swapped out under them, they may call the loan due. Mortgages are almost always explicitly 'non assumable'
Now that interest rates are relatively high, people are willing to take the risk
I noticed the people selling these things are incredibly obtuse about what the process entails and how it can screw you over later. If they take the asset, and you get stuck paying off the loan, you're out of the house AND the loan amount which would be devastating for most people
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