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This has nothing to do with investing in property. This is about loans (in crypto) and collateral and they don't match.
The volatility of crypto makes it impossible to use property as collateral as it can't be sold quicly enought. If the borrower defaults, then the loaner is left with the property and if the value of crypto spiked, then the loaner will get way less in term of crypto back. If the value of the crypto has droped, then the borrower will pay much less to return the loan and the loaner will get less in terms of fiat value.
As you can see, this trade is only beneficial to the borrower so for this reason, you will not find someone to lend you crypto based on property collateral.