[eslaught]

Here are a few of the prominent past HN posts:

Dungeons and Dragons’ new license tightens its grip on competition https://news.ycombinator.com/item?id=34264777

An Update on the Open Game License (OGL) https://news.ycombinator.com/item?id=34370340

Basically WotC wanted to not only change their future content to a more restrictive license, they also wanted to retroactively switch older content to that license. It seemed like an obvious legal land-grab. Fans objected, and (at least to my surprise, others here seem to be more cynical) WotC did a 180 on the license and adopted CC-4.0-BY.