Trust is hard to build and easy to break and even harder to rebuild.

To truly rebuild trust, they’d need to commit to never doing this again. That would mean 1. a change to the legal TOS that a developer who licenses for a project at a certain pricing level may remain at that price level for that project / that generation of Unity for as long as they wish, 2. a public commitment to never require per-install pricing, and ideally 3. the resignation of whoever came up with this brain dead idea.