Earlier quoted context omitted.
They don't want developers choosing to target older Unity versions for their games, they want to milk cent they can out of their users.
That and/or they wanted to set up existing games. Something like 1 in 5 of top 50 iOS games, free-to-play and majority Asian(Chinese or Japanese), are making banks and on Unity. Personally I’m wondering if Chinese gamedev industry would “buy Godot” or do something to that effect. Japanese publishers won’t be able to do that nor would be willing to pay, so I’m guessing they’ll migrate existing to UE or wind down Unity…
(Or, at least they say they are.)