It's about revision history, as Matt laid out here: https://wordpress.org/news/2024/09/wp-engine/

However, disabling revision history is a setting offered as part of WordPress: https://wordpress.org/documentation/article/revisions/#revis...

I'd argue that WordPress.com, the paid hosting platform that Automattic operates, is more of a "hacked up, bastardized simulacra of WordPress’s GPL code". By default you can only load a subset of themes or plugins and only if you choose the Business plan or higher. This seems like a bigger issue than having revisions turned off with a WordPress-provided setting.

It also seems a bit rich to be offering a product using the GPL license and then being upset that people make changes to it?