(Bloomberg) -- When Michael Saylor’s Strategy raised $2 billion in a convertible debt deal last week, it seemed like another triumph for firms rapidly selling equity-linked notes to fund cryptocurrency purchases. Behind the headline number, Strategy’s move to sweeten the deal’s terms sent a different signal: the market for crypto-related paper is nearing saturation.Most Read from BloombergTrump Targets $128 Billion California High-Speed Rail ProjectTrump Asserts Power Over NYC, Proclaims ‘Long L