Note: Terraria for stadia is uncanceled[0]. Sadly, Terraria devs nor Google has said anything about what happened (in any kind of detail), but accounts were unlocked and game is back on.
[0] https://forums.terraria.org/index.php?threads/terraria-state...
This is especially true given Google’s poor reputation for support even with paid products. Right now would be a key moment for a post mortem response detailing what they’ve done to ensure that developers don’t have to worry about being locked out and customers don’t have to worry about losing access to their purchases. This is an unproven service and anyone who is at all worried has multiple safer options available so trust is especially critical.
https://forums.terraria.org/index.php?threads/terraria-state...
Disclaimer: I work at Google, but don’t work anywhere near this.