The README for the repository I set up has some details on why I think a public record is important for any Q+A with Ruby Central.

See the screenshot below for details.

And to add your own questions, go here:
https://github.com/community-research-on-ruby-governance/questions-for-ruby-central

So the way I read this is a sponsor forced this action by Ruby Central.

If that sponsor was Shopify, then in effect, this confirms that a company that DHH is a board member of forced this action.

If not, who was responsible for this then?

This is a very important question that needs to be answered.

( From a Ruby Central board member's writeup, here: https://apiguy.substack.com/p/a-board-members-perspective-of-the )