This is bad, very bad. A complete and utter disrespect for people who poured in their blood and sweat in creating the content for them and for free. Migrating only "top" content is insufficient and so ignorant. The value of wiki is almost entirely in long tail. Vast majority of Unreal engine is undocumented where you get all kind of issues few have seen before. If it wasn't for the community creating content for them, it would be unusable for many users. To salt the wound, they aren't even telling you exactly why they are doing this. Why making read-only archive is so hard, at very minimum. Didn't expect this from Tom Sweeney's company.