From Gold to Diamond: Is Equitable Open Access Still a Mirage? - TL;DR - Digital Science

"Gold Open Access—the model where authors (or their funders) pay article processing charges to make work freely available—has grown steadily over the past decade. But if you look closely, the growth is slowing. And what’s taking its place isn’t the altruistic, community-powered model many hoped for. Instead, Hybrid Open Access is filling the gap: a model where paywalled journals charge extra to make select articles open.

Diamond Open Access—where publishing is free for both authors and readers, supported by institutions rather than APCs—has been making headlines. But here’s the uncomfortable truth: we still don’t have enough data to know whether Diamond OA is actually growing or simply being talked about more...."