Let's all take a moment to imagine that OP's friend invested that $2,000,000 into Bitcoin when he introduced Bitcoin to him in 2014. He could've earned another million dollars or maybe more by now.

I guess Bitcoin mining is still profitable with that large amount of money if you're able to get the mining rigs for a cheap amount. I would suggest that you put your mining rigs in a country wherein it's always cold so keeping the temperature of the rigs wouldn't be another thing to spend your money with.

Nevertheless, how did your friend got his $2M? Why don't he just keep doing what he's already doing. You and your friend seems to have no idea about Bitcoin mining, after all.