1. Own a buisiness
2. Give people payment invoices where they have to pay in a mixture of cash, check, money order, Paypal, and Home Depot gift cards (in Europe)
3. They can never take all of your funds because each of those things are safe for small amounts.
That's clearly what he should have done.
Unfortunately, i couldn't pay with cash, money order, paypal or gift cards $150K to my contractor. The only option is bank transfer.
Send him a bank transfer from money that you immediately bought for Bitcoin, his bank account will immediately get frozen.