What do Good Eggs, a startup that delivers $4.99 broccoli bunches, and Tonal, a fitness startup that sells $3,995 exercise equipment, have in common—other than a business model subsidized by venture capital? They’re both engaged in a painful type of financing known as a “cram down.” If you grew up in the era of easy money, ultralow interest rates and 100 times multiples, it’s possible you’...