The only notice I received was after-the-fact. Sorry.
Learning of GNOME'S cavalier attitude toward user reports and eventual product direction was exactly why I moved off the platform in the intervening years. I had high hopes when I was young and naive.
I realize GNOME is volunteer-based with a pillar of corporate backing from Red Hat and similar, but it strikes me as botched that if enough will existed to migrate to GitLab, an endeavor that requires serious engineering hours of research and planning and execution, that nobody could have said: let's query and build a list of unique email addresses from bug reporters and personally email them once with a quick letter, letting them know what they need to do. Compared to the actual migration, that is drops in a bathtub. Simple due diligence for user-facing goodwill.
I want to be sympathetic — really.
JWZ's CADT supposition has a lot of explanatory power here combined with the opportunity to "scrub a lot of bugs quickly".