Puh-lease. Unity's "hara-kiri" was in 2023 by which time Godot was NINE years old. Hara-kiri or no hara-kiri Godot has shown longevity and relevance. Anything gained from Unity's own-goals is just cherry on top.
This was true until a couple of years ago. Recently things really picked up. That said, there are still many years old open PRs unmerged that make great additions; maybe this policy will free up resources to move forward with those.