Maybe viewed by regulators as too risky for retail. Maybe only accredited investors. Business purpose over personal is telling.
Unchained to Pause Bitcoin Backed Loans to Individuals
"Due to external requirements, new loan originations to individual borrowers will be paused beginning January 1, 2024. We will continue originating new loans for legal entities such as LLCs or corporations after January 1 for business or investment purposes."
https://www.nobsbitcoin.com/unchained-to-stop-offering-bitcoin-backed-loans-to-individuals/
Discussion
How can it be risky? The collateral is 250%. It is purely an attack on Bitcoin, nothing more.