Has Michael Saylor’s Strategy built a house of cards?

Strategy Inc, formerly MicroStrategy, has discarded its core product, assumed a new identity, swallowed over half a million Bitcoin, spawned equity classes with double-digit yields, and inspired an arsenal of leveraged exchange-traded funds (ETFs) — a unique and significant market phenomenon.

Michael Saylor’s firm has constructed a comprehensive financial framework based around Bitcoin (BTC), tying its corporate performance directly to the cryptocurrency’s price fluctuations. As a result...