A long time ago, I remember a MySQL talk where they explained dual-license as "if you make money, then we make money", while keeping the product FOSS. I think

A long time ago, I remember a MySQL talk where they explained dual-license as "if you make money, then we make money", while keeping the product FOSS. I think it's a reasonable simplification. And if the company changes the licence, then a A/GPL fork can survive (c.f. Hashicorp, which could have probably avoided their issues with a better licence from the start, but at the time no one expected to be eclipsed by big cloud providers with infinite resources).